Hi Jennifer,

Nowhere in the code does it indicate what either LastRow or FindLastRow are.
It appears that FindLastRow is the name of a function. If it is where is it?
It also appear that LastRow is the name of a variable. Where is this variable
declared?

The error message variable not defined is telling you that VBA does not
think this variable has been declared yet.

By the way, the code you are using to populate the combo boxes can be
achieved in one line like this:

cboVend.List = wksLookupLists.Range("VendorList").Value

Good Luck.