Groups in Endnote X1

If I send a library which has groups: A, B and C to someone who has a library with the same named groups, when they import the library the references only go into All References.  Would it be possible for them to go into the custom groups as well? The only other way of doing it at the moment seems to be to have the references labelled with the group names, which you would then have to search for and copy over to the relevent group.