Most of the "Edit" menu's entries are self-explaining. Therefore, only some important commands are explained.
Add Submenu >
Add to Default Hub
All new nodes will be added to the → "Relationship Editor's'” default → hub.
Copy Submenu >
Position, Rotation, Scale, Shear, Transformations
Select two nodes A and B. Click on a command to transfer the parameter values from A to B.
Snap Submenu >
Nearest side
Select two nodes A and B. A is the reference. The command brings the two nodes as close as possible together.
Nearest side (expanding)
Select two nodes A and B. A is the reference. The command stretches node B until it touches node A.
Freeze transformations
Set/reset an object's transformation matrix.
Reset transformations
Restore an object's original transformations.
Clone selected
Create an identical copy from the selected node. If a node cannot be cloned you will get a warning message.
Back culled selected
Exclude invisible polygons from your selection.