Detail Style-Dimensioning - Assemblies-Reference Points tab
Here, you select the component parts or main and subgroups for which you want to attach individual add-on dimensions in the main views of the detail (front view, plan view, etc.) and determine the dimension points as well as the position of dimension chains.
A complete group is dimensioned over its outer dimensions like a single component part.
Tip: For the essential settings on this dialog tab, please
refer to the general descriptions of defaults —Dimensioning Chain
Settings topic.