How do I allow multiple promotion codes in Canvas Catalog?
As a Canvas Catalog admin, you can decide to leave the Allow Multiple Promotion Codes setting on or turn it off. When the Allow Multiple Promotions Code settings is set to No, users can apply only one promotion code per checkout, the user interface displays a single input field for promo codes, and if multiple codes are entered, only the first will be applied.
Open Admin

Click the User Name drop-down menu [1]. Then, click the Admin link [2].
View Catalog Info

In the Account Navigation Menu, the Catalog Info tab displays by default.
Allow Multiple Promotion Codes

By default, learners can use multiple promotion codes.
In the Catalog Info page, to turn off multiple promotion codes, click the Allow Multiple Promotion Codes drop-down menu [1] and select the No option [2].
When the Allow Multiple Promotions Code settings is set to No, users can apply only one promotion code per checkout, the user interface displays a single input field for promo codes, and if multiple codes are entered, only the first will be applied.
Save Catalog Info

Click the Save button.