This is from the help system, but I still don't understand. I thought it would either show or not show text that I typed into the dimension box in the PropertyManager like this ( TEST) but it didn't seem to change anything. Any insight offerd out there?
"Link external dim text. You can right-click the top-level icon in a drawing FeatureManager design tree and select or clear Link external dim text to control whether text added to a dimension is displayed. Text added to a dimension in a drawing becomes an attribute of the dimension. The default is to have the option enabled."