The Remove Equipment from this Drawing command is used to remove equipment from a drawing while leaving it in the database.
To remove a piece of equipment from the drawing, go to
Ribbon: DM Electrical->Devices-> 
Remove Equipment from this Drawing
Pulldown Menu: DM Electrical->Equipment->Remove Equipment from this Drawing
You will be prompted to select the equipment to remove from the drawing.
Select equipment to remove from drawing:
The selected equipment will be removed from the drawing but remain in the database. If it was connected to a circuit, it will remain connected.
You can use the Insert Equipment on this Drawing command to reinsert the equipment.