i have a form for data entry based on a table tblexp and would like to put a list box in based on another table so that the user can select multiple items. Both tables will have a linking field (don't know if this is necessary!) so that I can pull all the info together on a report.

I would then like these selections to populate an underlying table.
how do I do this?

I have looked through previous posts but either cannot find what I'm looking for or there is too much code. I'm relatively new to this.