Independant Selector Controls Per Sub-form Row

I'm new to Access so apologies in advance if this occurs as simple-headed...

Given a group identifier (e.g. department) I want to display a list of members (e.g. employees) in that group. So I use a sub-form in datasheet view.

Now I want to associate an independant checkbox with each row so that I can identify partiuclar members for some action (e.g. assign to a project).

Thus, I need to set up the checkboxes on each rsub-form ow and then be able to probe them later and get their state and any other info on the row (e.g. key(s) for the individual members).

All help / advice / references welcome!