Slider with fixed locations

Hello all

I was trying to look for a tutorial for a slider which will lock on fixed positions. (does that make any sense? it’s really hard for me to explain what I mean. If I need to explain further please tell me so.)
English is not my native language and I somehow could not come up with a search term which produces a result :frowning:
I tried to search in german too, but no luck there as well.

Thanks in advance

Carlo