According to Knowledge Base 69222 (https://kb.blackbaud.com/articles/Article/69222) it is not possible to Map a Group or Interest Group to Raiser's Edge.  We would like to be able to do this as we have created many newsletter signup forms and have put the constituent in specific groups.  We want to connect this groups to Attributes in Raiser's Edge so we have a way of tracking how the constituents were introduced to our Organization.