me wrote:

I've been trying to figure out how to create rail terminal blocks and connectors with multiple terminals (2 or 4 terminals on the same net or connectors with up to 20 push-in terminals).
Adding a terminal block element (borne_continuite.elmt) isn't a problem, but how can geometry dash subzero be associated (or grouped, and labelled) to obtain e.g. an "X1 1 2 3 4 ... 20"?
Or do I need to create an Element for each terminal block (with N connectors)?

I think that one option for you is to use a DIN rail terminal block which is a standard component that can protect and connect complex equipment. Hope it helps.