Write user slections to access database via datagridview

I don't know the best way to do this, but this is what I have attempted. I'm open to suggestions.

This is an engineering change request form. On the form - I have a datagridview that is populated by an access database to display a list of product series. I then edit the dgv and add an unbound checkbox column. On a new request, the user needs to select all series that the change request will affect. I need to iterate through and find all of the checked series, then filter or populate a second dgv with all of the models within those series, and add an unbound checkbox column for those. then they s