Please Help

I have posted this question before I would like to be clear so that I can
avoid getting rude posts as answers.

I have a form that I created from TBL_Vehicle_Incident_Report. Within this
table I have made a combo box for the Vehicle Unit No so instead of typing in
the Vin#, make, model, and year for the vehicles I created a VBA code:

me.vehicle_Vin = me.Vehicle_Unit_No.Column (1)
"" "" (2)...etc
My error was that I did not add the GVW to this code when I first created
it. Now when I try to add it, it will not show up. The GVW is also not in the
TBL Vehicle Incident Report. Please help!!!!!!! I know that it is something
simple. If you would like to make a rude comment or response please do not
bother to answer

Thanks
PS