Ok i need help!!

I have a form, which has a query behind it.

what the form does is: lets you choose a name of a staff member (a) and then another name (b)

and you enter the hours soo it calcluates (salary of staff a times hours) and adds this 2 (salary of b time hours) to give you a total!!

What i want to do is add a tick box which will allow staff member b to be blanked out soo when i add the hours it should only calculate (salary of a times hours ) AND not let user choose name of b frm the combo box!!!

how can i do this??? :confused:

When you do your calculation, you could Lock the Combobox, Disable the Combobox or Hide the Combobox, and restore it when they move to the next record or whatever.