SASS: How to enable only some breakpoints? Also can be created CSS build for mobile and desktop version separatly to load only some css based on media

[suche-cz]

Hello, is there any possibility to load only some breakpoints ?
Currently there are sm-xxl sizes, but I need only sm, md and lg

With this, I also want to build pico for mobile devices and desktop separatly, how to do that?

I can do that by overwriting Pico source files but it's not a good way.

Thank you for any tips.