Yes, you can return items for store credit.
Please note that the store credit amount for each item will be proportionally reduced, to include the free item(s).
If any item is returned from a Buy Two, Get One Free or a Buy Four, Get Two Free sale, for example, the store credit will be equal to the original price of the item reduced by the proportional discounted amount.
Here is an example:
If you purchased two items, both at $200, and got another item free, at $100 value, in a Buy Two, Get One Free sale, you will have received the lowest-cost item ($100) for free.
Your store credit will then be spread proportionally across all three items.
This means that both of the $200 items will be reduced by $66.6 each (you will get $133.40 for each of these items) and the $100 item will be reduced by $33.3 (you will get $66.70).
If a single order contains one or more items to which a discount code and been applied, and one or more items to which no discount code has been applied, the refund amount will be automatically reduced by the proportional discounted amount across all products on the order regardless.
For this reason, we recommend that you purchase items using a discount code separately from orders in which you do not intend to use a discount code.