Location: 06 Wood & Plastic/Trim & Moulding
Identical to Trim Panel JM9, except it's an object instead of a window, and it lays flat.
It's for putting panels in slabs, for ceilings.
No, it can't actually cut the hole. You have to do that, using SEOs. Target: slab, operator: panel object. Subtract with downwards extrusion. (There is evidence of a SLABHOLE capability in AC, but it is not realized.)
You can choose to show it in the RCP by putting on the layer F Trim Crown.
The 'cut' shapes are editable in plan.
You can show a fill inside the plan polygon.