To create a voucher for a parent to use for a discount on a program registration, you'll follow these steps.
First, go to Programs and Program List and choose your program. Then go to Features and click +New Feature:
Give your feature a name, a category (either a new category or choose from the dropdown list), a description, and indicate who the feature would be available to (age & gender limitations).
Enter the Quantity Available to a single user (the amount of times a user can use the code - usually just 1), the Total Available (1 for a single use voucher, or enter the total number available), the amount (a negative number for a voucher) and the Voucher Code (the code the user will enter to get the discount). Then mark it as Active to turn the voucher on, and click Save: