Empty Properties
The Empty Properties Menu allows the user to select the target object or scene for certain types of empties. It can be found in the Object Properties-menu on the right hand side of the screen, under Object Data Properties when the active object is a valid empty.
Subpart Empty
Subpart Scene
This option becomes available if the active object is a subpart empty. Clicking it brings up a list of all scenes of the scene type Subpart to select from and link the empty with.
Highlight Empty
Highlight Objects
This option becomes available if the active object is a highlight empty.
Add
Clicking it adds a slot for an object in the list below. Clicking the empty entry brings up a list of all objects in the scene to select from and link the empty with. Clicking the minus-symbol next to a slot removes the entry. Refer to the Highlight Empty Tutorial to learn how to use these empties.