The Dynamic Custom Coordinate System (Dynamic CCS) creates a temporary XY plane on a planar face of a 3D solid object so you can draw on that plane.
It works automatically and avoids creating a new CCS using the CCS command.
The Dynamic CCS applies when you run
To turn Dynamic CCS on and off:
To apply Dynamic CCS:
The edges of the planar face are highlighted.
The crosshairs, coordinate symbol, and grid change according to the Dynamic CCS XY plane.