Can I refund just some codes?

Yes, AppSumo allows you to refund only some codes.

In order to refund only a specific code, you should log in to your AppSumo account and access your purchases where you will find the codes listed. Each one has a menu available next to where you can refund only that specific code.

If you refund only some codes and you have already stacked them, we'll decrease your account limits to match the new number of stacked codes.