Processing multiple memberships in one transaction

Hi all,

Here at the Royal New Zealand Ballet we have 2 memberships - Dress Circle and Friends of the Ballet. We have quite a bit of cross over/people who have active memberships for both that have previously been processed manually via two transactions. 

Has any one managed to come up with a work around that would allow this to be processed in one transaction, particularly through TNEW (we are migrating to v7 shortly).

Thanks, 

Anna