Hi infoNewbie - sorry for the late reply - not sure if this is still causing an issue for you.
Let's say your Access database table columns are: project # and project Member. In this example, there can be many project Members for
each project# e.g.
Project # Member
1 Bob
1 Mary
1 Jane
2 Mary
2 Jane
The users are completing an Info path form to populate this table and specify the members for a particular Project #
You want them just to enter the project # once:
Project #: 1
Names: Bob
Mary
Jane
Have a look at the attached Info path form template - it's not
linked to Microsoft Access database, but demonstrates how you can
populate a repeating table with a value in all rows from an external
field the user fills in.