Forms :: Select Recordset ID For Inclusion As Foreign Key In Table

Trying to use a form based on a table to choose a recordset of values, and pick the ID of that recordset to include in another table as a foreign key.

I am not sure how to even search for what I'm trying to do, though I've tried all the variants I can think of anyway.

The idea being that there are a set of values that are associated with each other, and generally found in conjunction with another set of data. So Table 1 contains data such as this, though this is greatly simplified from the numerics that are actually stored in these fields:

FooID Field 1 Field 2 Field 3 etc, etc...
1 x y z
2 d y z
3 x y q
4 x r P
.
.
.

This data is then associated with the information in table 2, and rather than repeat fields 1-whatever in table 2 I want to use the FooID in table 2 to store the link to all of the subsequent field data. Normalization as I understand it in other words.

I cannot figure out how to pull the table 1 data into a datasheet form and allow someone to choose one of the lines of data, store the FooID into an unbound text box, or some other method, and then run an update query on table 2 to update a field with the FooID for the 12-72 records that are in that table.

Would this make more sense as a combo box in a single form? I've been trying to do this with a datasheet, but I think I'm too limited in appending a check box to an individual recordset this way, or at least I've not managed to get it to work so far anyway.