There has to be a way that I can pull in the Drawing Units being used. Specifically the Length Units. or dual dimension units.

My company uses both Inch and Millimeter dimensions. I have a universal tolerance block that covers both. But I need a field that updates to which system has been selected on the drawing.

"UNLESS OTHERWISE SPECIFIED; ALL DIMENSIONS IN INCHES OR MM"

Units are a document specific property, and you can access them in macros.

swUserPreferenceIntegerValue_e.swUnitSystem

swUserPreferenceIntegerValue_e.swUnitsLinear

But how can I access the property as a text field in my title block?