How do you add a field to a subform in Access?
In the Property Sheet, click the Data tab. next to the Link Child Fields property box. The Subform Field Linker dialog box appears. In the Master Fields and Child Fields drop-down lists, select the fields that you want to link the forms with, and then click OK.
What are the advantages of a sub form?
A subform is a form placed inside another form. By using a subform, you can fit more objects into a smaller area, without making the form illegible. For example, you have an invoice form in which you want to place information about the customer in the upper right corner.