ok here we go...

i have a form where two prices are added:

one is a total price of parts used in a subform,
the other is a value for a labour charge.

I have managed to sum these 2 values using a formula in control source.

The problem is that i now cannot bind the value to my original table.

I have been told that i should make a hidden text box that is linked to the table. This hidden text box should contain a copied value of the 'total' text box.

I have no idea how to do this and would be greatful for some help.

Cheers

You do not need to store this value in the table. To do so would be redundant. Simply include the calculation in a query/report/form whenever you need it.