This is my first post on this forum so apologies if my question has been posed and answered before.
Basically I would like to know whether it's possible to import a new attribute onto a constituent's record, through IOM, irrespective of whether they've got an attribute of that same category on their record already? We have an attribute category of Mailing Exclusions which a constituent can have more than one of on their record but when I try to import a new attribute of that category it just overwrites any current one.
I can get IOM to import the attribute when there isn't already one of that type on the record but I can't seem to make it differentiate between any current attribute and the new one I want to import.
Any insight would be extremely helpful!