Yes. Previous email pointed to help that would explain more, but here two options:
1. Create album in one file and add records you want to merge into other file. Then when merging, choose records from that album instead of all records. (equivalently, you could export that album to a new file and them merge in all records of that file)
2. If small number of records, just select them in one file and drag to the other. Only feature unavailable when dragging is to attach a note to each record. It still creates a folder with all merged records and will include all other records needed by those dragged individual, or other record types, as well.
Note that internally both these options use identical code. Just pick the one that is easiest (I like drag and drop myself).