Help with code please

Beginner Here



I have created a table "QuickCalc" and form "frmQuickCalc" to calculate some developments figures.



I have a field "NHBC" with an expression of: =[TotalResale]*0.007.

I have this expression in the control source so obvisously it is not saving these figures back to the table.



I understand I should put the control source for this field back to "NHBC" linking it back to my table.



How do I then write the expression and where should this go, ideally im guessing it should be in the on change event for the TotalResale field????



Thanks



Jon

Help with code please