Paul,
I apologize for being dense but I've been trying to follow what you've said. So I'm going to print your instructions and substitue my names in place of your field/combo names.
If your situation is that rare one where saving the related info is necessary, you'd use the same combo. In the textbox, instead of the formula as the control source, you'd list the field (GageID) in the Orders table (Calibration DC) where you wanted the phone number (GageID) saved. In the after update event of the combo, you'd have code like this to copy the value over:
Me.TextboxName = Me.ComboName.Column(2)
Me.Gage ID = Me.Gage Description.Column(1)
Maybe the problem is (besides my lack of understanding) the name. As I see the Text Box Name (Gage ID) and the Combo Name (Gage Description) they both have spaces between the first and second parts.
What did I do wrong and not understand?
Don.........