1. From POS/Invoice Processing, Navigate to [File Management] > [Buy X Get Y Free Maintenance]

2. Select Manufacturer, Product Code and Weight (if applicable)

3.  Enter Quantity to Buy (How many do the customers need to purchase?), Quantity to Get (How many Free goods does the customer earn?) ,and Cut-off Dates (If applicable).
Frequent Buyer Programs will state Cut Off Dates in the Program's Description page in Astro. Leave blank if there are no Cut- Off Dates. 

4.  Enter item earned, days and Days to Purge Old Purchases (if applicable).  NOTE that "Send To Astro" MUST be checked if Astro Frequent Buyer Program.