There is a hole component on my warehouse page, however it is created using inches
This is a metric version, a through hole DC and a stopped hole DC. (saveas them to a folder of your choice). The stop component has been added to the raw surface inside the white board and it attributes altered to suit a range of adjustable shelf positions.
metric holes.skp (166.6 KB)
I place a "through hole component set the side width with the shelf position holes to change with the shelf height in your example. The degree of complexity is up to what configurations you want a DC to be.
However what ever choice, being Dave’s idea or variation of it or this one, you do need to simplify the DC before sending to CNC, that is outer shell Dave’s example or double explode my hole DC.
example (4).skp (172.1 KB)
see PM sent