Multiple Promo Code

What specific challenge or problem does this idea solve?

Ability to have the option to give multiple promos for one registration.

How should this work?

Add each promo code at time of check out.

Who will benefit (Admins, Staff, Students)?

Students - more discounts available for them.

How will this change impact your daily tasks or overall experience?

Improve our backend ability to not have to manually adjust or credit the account for each additional promo code used.