changing textbox in main form from subform

[chucky]

am new to acces so it may be easy. I have a form with a subform. In my sub form i click a check box and change the specific component price. Then on that field change i want to change the total price of the quote, this is in the main form.

So basicaly i want to change the field in a form from the subform code.

 

[Geoff Codd]

To reference a main form from a subform

Forms!MainForm!FieldName