# Create and manage rules > You can choose from a series of attributes, conditions, and effects to create rules for your campaigns with full flexibility. > For the complete documentation index, see [llms.txt](https://docs.talon.one/llms.txt). You can build more than one rule within the same campaign. In this case, the Campaign Manager evaluates all of them in the order in which they appear. ## Create a rule You can create rules of the following [types](/docs/product/rules/overview.md#rule-types): - [Promotion rules](#create-a-promotion-rule) - [Strikethrough rules](#create-a-strikethrough-rule) :::tip Rules can also be created from a [blueprint](/docs/product/rules/blueprints.md). ::: ### Create a promotion rule [Promotion rules](/docs/product/rules/overview.md#promotion-rules) allow you to define conditions and effects following the logic `WHEN THEN `. Each promotion rule requires at least one condition and one effect. To create a promotion rule: 1. On the left-side menu of your campaign, click **Rule Builder**. 1. In the **Promotion** tab, click **Create Rule**. :::important To create a promotion rule in an [item campaign](/docs/product/campaigns/overview#item-campaigns), ensure you have created a [cart item filter](/docs/product/rules/cart-item-filters/overview.md) first. ::: 1. Type a name for your rule. Alternatively, to automatically generate a name, add conditions and effects as explained below and click **Autofill**. 1. In **Conditions**, click **Add Condition** and choose a [condition](/docs/product/rules/conditions/available-conditions.md). Alternatively, to run the rule on every customer session update, click **Always trigger effects**. :::note Referrals, coupons and loyalty conditions are only available if you [have enabled these features](/docs/product/campaigns/settings/manage-campaign-features). ::: 1. Set the required values and the necessary attributes. 1. Click **Done**. 1. To add a [failure effect](/docs/product/rules/conditions/use-conditions.md#add-a-failure-effect-to-a-condition), hover over the condition and click **Add Failure Effect**. 1. In **Effects**, click **Add Effect** and choose an [effect](/docs/product/rules/effects/available-effects.md). 1. Set the required values and attributes. 1. Click **Done**. 1. In the top-right corner of the page, click **Save**. [Activate your campaign](/docs/product/campaigns/create-and-manage-campaigns.md#activate-a-campaign) to start testing your rule. ### Create a strikethrough rule [Strikethrough rules](/docs/product/rules/overview.md#strikethrough-rules) allow you to set _per-item_ effects. You can build strikethrough rules by creating at least one of the following: - A [cart item filter](/docs/product/rules/cart-item-filters/overview.md) in a campaign. - An [Application cart item filter](/docs/product/applications/manage-application-cart-item-filters.md). - A [value map](/docs/product/rules/manage-value-map.md). Each strikethrough rule requires at least one effect. :::important Prerequisites To create a strikethrough rule using cart item filters, ensure the following: 1. You have connected a [cart item catalog](/docs/product/account/dev-tools/manage-cart-item-catalogs.md) to your Application. 1. You have [enabled the strikethrough feature](/docs/product/campaigns/settings/manage-campaign-features.md) in your campaign. 1. You have created at least one cart item filter with the following requirements: - It **filters items by conditions**. - It uses only attributes whose associated entity is **item**, **campaign**, or **Application**. - It does not use attributes whose type is **Time**. Alternatively, you have created an Application cart item filter or a value map. ::: To create a strikethrough rule: 1. On the left-side menu of your campaign, click **Rule Builder**. 1. In the **Strikethrough** tab, click **Create Rule**. 1. Type a name for your rule.Alternatively, to automatically generate a name, add effects as explained below and click **Autofill**. 1. In **Effects**, click **Add Effect** and choose an [effect](/docs/product/rules/effects/available-strikethrough-effects.md). 1. Set the required values and attributes. 1. Click **Done**. 1. In the top-right corner of the page, click **Save**. [Activate your campaign](/docs/product/campaigns/create-and-manage-campaigns.md#activate-a-campaign) and start testing your rule. ## Edit a rule You can modify a rule's title, conditions, and effects. For example, you can change the value of a discount, or edit a notification. :::note If the rule is a [strikethrough rule](/docs/product/rules/overview.md#strikethrough-rules), you can edit only the title and effects. ::: To edit a rule: 1. On the left-side menu of the campaign containing the rule you want to edit, click **Rule Builder**. 1. Click the rule you want to edit and make the required changes. 1. In the top-right corner of the page, click **Save**. ## Edit rule details With rule details, you can manage how rule information is presented to customers. For example, you can define a customer-facing name for the rule's effects, explain how it works, and attach additional data such as an image URL, vendor name, or a content management system (CMS) ID. Your development team can then make this information visible to customers through your integration using the [List all running campaigns](/integration-api#tag/Campaigns/operation/integrationGetAllCampaigns) endpoint. To edit rule details: 1. On the left-side menu of the campaign containing the rule you want to edit, click **Rule Builder**. 1. To the right of the rule, click **Edit rule details**. 1. You can enter the following information: - **Display name**: A customer-facing name for the rule. - Example: `20% off all shoes!` - **Display description**: A customer-facing description that explains the details of the rule, such as eligibility requirements, reward timelines, or terms and conditions. - Example: `20% discount for Thanksgiving! Offer valid till Dec 5 only.` - **Related data**: Any additional data associated with the rule, such as an image URL, vendor name, or a content management system (CMS) ID. 1. Click **Save**. ## Copy a rule You can copy a rule to duplicate it and edit part of it, such as the value of a discount. This way, you create a new, similar rule without having to build it from the beginning. You can only copy rules within the same campaign. :::note Rules can be copied [as promotion rules or as strikethrough rules](/docs/product/rules/overview.md#rule-types) if the **strikethrough** feature is [enabled in the campaign](/docs/product/campaigns/settings/manage-campaign-features.md). ::: To copy a rule: 1. On the left-side menu of the campaign containing the rule you want to copy, click **Rule Builder**. 1. To the right of the rule you want to copy, click . 1. Choose to copy the rule [as a strikethrough rule or as a promotion rule](/docs/product/rules/overview.md#rule-types). - If you copy a rule as a strikethrough rule, you can edit the title and effects. :::note You can only copy a promotion rule as a strikethrough rule if its effects are _per-item_ and the list of cart items is a [cart item filter](/docs/product/rules/cart-item-filters/overview.md) that filters by attribute value. ::: - If you copy a rule as a promotion rule, you can edit the title, conditions, and effects. :::note If you copied it from a strikethrough rule, the default condition is **Always trigger effects**. ::: 1. In the top-right corner of the page, click **Save**. ## Delete a rule You can delete promotion or strikethrough rules that you don't need anymore. To delete a rule: 1. On the left-side menu of the campaign containing the rule you want to delete, click **Rule Builder**. 1. To the right of the rule you want to delete, click . 1. In the pop-up that appears, click **Delete Rule: <rule name>**. ## Use rounding in a condition or effect When creating or managing a rule in the **Rule Builder**, you can round any numeric values in your conditions and effects. To use rounding in a condition or effect: 1. Enter a number or an attribute of type `number` in the text field. 1. To display the rounding options, click and drag to select the value. 1. Select a rounding option: - **Round**: Rounds to the nearest integer, up or down. - If the fractional part of the number is >= `0.5`, it rounds up. For example, `27.500001` rounds up to `28`. - If the fractional part of the number is < `0.5`, it rounds down. For example, `13.49999` rounds down to `13`. - **Round Up**: Always rounds up to the nearest integer. - **Round Down**: Always rounds down to the nearest integer. :::note Generally, Talon.One rounds values to five decimal places before processing them further, but there are exceptions: - [Pro rata discounts](/docs/product/rules/effects/use-effects.md#discount-individual-items-pro-rata) are rounded to a specific number of decimal places depending on the currency set in the Application. Example: For USD, Talon.One rounds to two decimal places, meaning a pro rata discount of $100 on three items of the same price rounds to two decimal places to give $33.34, $33.33, and $33.33. - For effects that reward your customers with [loyalty points](/docs/product/rules/effects/use-effects.md#add-loyalty-points), values are rounded to two decimal places. ::: :::tip To round to two decimal places, multiply a value by 100 to round the result to the nearest integer and divide by 100. ::: ## Related pages - [Campaign evaluation](/docs/product/applications/evaluation-order-for-rules-and-filters.md) - [Cart item filters](/docs/product/rules/cart-item-filters/overview.md) - [Create a campaign to issue a discount on the session total](/docs/product/tutorials/coupons/basic-discount.md) - [Create a quantity discount](/docs/product/tutorials/coupons/quantity-discount.md#round-down-discount-values)