If you are talking learning from a particular Industrial Manuf. controls course.
Most current controls have always used similar design principle to achieve the same end, they just go about it their own unique manner.
I have taken Fanuc and Mitsubishi courses, the Fanuc cost $$$, Mitsubishi used to offer their course free, you just had to make your way there.
I have never come across a recognized course on CNC per-se.
The problem is the whole subject can cover many disciplines, Electrical, Electronic, Mechanical, Hydraulic etc.
That is just the machine design, maintenance side, then there is the part programming area that covers CAD/CAM and G-Code programming.
For the latter, it helps also to have some knowledge of machining.
This appears to be the field you want to get into, for this there should be further education courses.