How can I create a crossroad for info flow?

Hello forum, I’ve been getting back with the basics after long years of absence with GH and got cought up with this problem;

I was trying to model some simple chair model all in GH and wanted to be able to change the backrest slope with a nr slider however I couldn’t find a way to create a definition that would send data between some domains.

Here is a simple drawing to clarify what I wasn’t able to explain

Necessary also that the flow carries actual slider data [if x=2 go to first node with f(x)=2…]

Here is the definition in case you are wondering but there is not much to look at there. (45.0 KB)

Thank you very much and hope I was clear enough (45.4 KB)
With stream gate component.

Lovely! Thank you very much