Trimble Tilos Help
If an activity type is Summary or Hammock, use the Categories & Structures tab to view the subordinate or allocated activities.
On the Categories & Structures tab in the Object Properties pane, an activity can be allocated to one of the existing categories of the libraries.
Add Categories - Add categories.
Delete - Remove selected entries from the list.
Keep own Distance Coordinates - Assign distance coordinates directly to the Activity. If this option is not checked, then the distance coordinates are taken from the sub Activities.