Kevin:

This is one way of doing it.
Right click in the Frame Conductance field and select "Edit/View User Expression"
Copy and paste the following exactly as it is into the input field(case sensitive):

if(Local("GLASS-TYPE")==SymIndex("SB70XL","WINDOW","GLASS-TYPE"))
then 2.781
else 3
endif

To explain:
"GLASS-TYPE" is a keyword and "WINDOW" is a command.
Local is a function that calls a sister input cell.
SB70XL is the glass type, and can be any name of glazing types you have defined, except a keyword.
SymIndex returns strings.
Remember everything is case-sensitive!

Numbers should show up pink.
If you type "If statement" in the DOE2 help, there are several good examples.

Good Luck!

Linda Lam, LEED?? AP