# Reduce Item's Discount
The "Reduce Item's Discount" is a macro that runs as an action of the [*Rules Engine*](https://docs.linnworks.com/articles/#!documentation/rules-engine)*.* This macro allows for the manual reduction of discounts by a specified value provided by the client. This macro facilitates the modification of discounts for items in the item line of order with a 100% discount applied.
This guide provides a step-by-step explanation of how to install and set up the macro in Linnworks.
### Start using the macro
There are three steps you need to complete to start using the macro:
1. Install the application.
* Go to *Apps > Application Store >* Reduce Item's Discount *>* click Install and follow the on-screen instructions until the installation is complete.
2. Configure the macro.
3. Configure the rule in the *Rules Engine* screen.
#### Configure the macro
Once the Reduce Item's Discount app is installed:
1. Go to *Apps > Macro Configuration* and click + Add new configuration.
2. Select the *Reduce Item's Discount* macro and click Create Configuration.
3. In the *Macro Configuration* screen, specify the below details and click *Save*:
4. Make sure to enable the macro to continue with the *Rules Engine* configuration.
#### Functionality
1. **Discount Application:**
* Iterates through specified orders and evaluates each order item's value.
* Applies a discount to order items with a value of zero and a 100% discount already applied.
2. **Discount Calculation:**
* Calculates the discount value based on the provided discount percentage.
3. **Order Item Update:**
* Updates order items with the newly applied discounts to reflect the changes in pricing.
#### Usage
1. **Input Parameters:**
* `OrderIds`: Array of order IDs to process.
* `discountValue`: The discount percentage to apply to order items with a value of zero.
2. **Execution:**
* Call the macro with the desired order IDs and discount value to initiate the discount application process.
3. **Outcome:**
* The macro evaluates each order and applies discounts to qualifying order items as specified by the provided parameters.
* Order items with a value of zero and a 100% discount applied are updated with the new discount value.
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