The first three columns are from the components table and the last column (drop down) pulls data from supplier table (the component table has a link to the supplier table - see below)
Oh I took another look at this. I think I usually do this solution a different way. It may be possible to use auto-binding. It can work inside a Repeating group.
Takes a minute to get used to it but drop downs usually work pretty well with that approach.
I did try auto-binding (the other cells are using auto-binding).
The weird thing is the Field to Modify drop down does not include the suppliers field - just the first three fields. I think it is because the suppliers field is a link to another table?