MarketPress Batch import of coupon codes

I have a list of about 200 one time use coupon codes (from Groupon) that I want to add to my store. Has anyone does this before? I don't see any option to do a batch import and I certainly don't want to manually create each coupon. Is there a way I can export whichever table holds these codes as an.xls and then modify the .xls to include the new codes and import back in? If someone has any tips please share otherwise I'll work on it tonight and post a solution if I can get it to work.