Is there any option to show an existing CAD coordinate system or adding a new one in the drawing file?
There are cases in which it's important, such as:
When you want to instruct the inspection worker how to define (x,y,z) for mutual terminology.
When you want to order the manufacturer in which directions the machining should be done.
When you use composite direction in which there is an importance in which direction you lay up the fibers etc.