Hi, I've this problem / curiosity

I've a file with 200 slides, that I use in two different situation - same file, two classroom.

In the first, I'd like to use all my slides; in the 2nd, I'd like to use only a part of the presentation (jumping the slide n. 3 - 17 - 36 and so on...)

Without using the function "hide slide", how I can do it with the same file?
Thanks in advance for your answers.
Marco