Select model elements and detail elements, simultaneously. Click Modify | Multi-Select tabCreate panel (Create Group).
Select view-specific elements, tags, or dimensions that are associated with an existing model group, and click Modify | <Elements> tabCreate panel (Create Group).
Select an existing model group, and click Modify | Model Groups tabGroup panelEdit Group. Click Edit Group panel (Attach).
In the Create Model Group and Attached Detail Group dialog, enter a name for the model group (if necessary), and enter a name for the attached detail group.
Click OK.
In the Project Browser, the attached detail group displays under the model group that it belongs to.