michaelk,
yes, that was the problem. I tried to enter the command directly into the cell when I needed to use the database header row.
I noticed another problem. I read about it previously in a thread, but couldn't find it this time.
The door schedule has a quantity column. If it shows more than 1 item, the width or height column multiples the door width by the quantity. I used the "/C4" operand at the end of the equation so the Width column now reads "=((Door.Width)/C4)" (see attached)
I thought that would divide the width by the quantity and correctly display the width for a single window.
What is the right syntax to get the correct width?