Combo box problem
 

Hi,
I posted this question yesterday but I'm still having difficulty. I would
like a combo box, to display the options from column A and then return the
value from coloumn B into cell A6 and value from C into A7. I don't want to
use validation because I want those cells to not have any formula to allow
for 'custom sizes' which isn't in the combo box.
A B c
A4 297 210
A3 420 297

I think I have to use VBA but have no VBA knowledge so your help would be
much appreaciated.