When I need to import donations from another payment gateway, right now I have to go in, see which donations are from existing donors, find all the constituent IDs for those donors, and then do a separate constituent import of the new ones before importing all the gifts. It would be great to be able to import the file from the payment gateway and have the duplicate function find the people who are already in (even if I have to manually confirm that it is in fact a duplicate), assign their gifts to them, and create a new record for the new donors with their gifts attached while importing the document. I know it can be done because Salsa/DonorPro (our previous CRM) had this capability.