Could I combine two BP systems together?

I am a beginner. However, the project that I am attempting one idea that I have had on my mind, as of late. Could I combine two systems together? Such as, Skateboarding system and third person shooter system? If so. How would I go about doing so?

Could I combine two BP systems
together?

Do you already have 2 working systems to combine? I don’t see why it would not be possible. How to do it would depend on what those systems are and how they work.

this is an extremely vague question, but yes its possible.
you can store all the code from the two systems in components and then just add them to the blueprints that need them
you can simply cut and paste all the code from one blueprint to another, and then add the needed variables and functions.