I'm not exactly sure what you are asking. If you're talking about nested loops (a loop inside of a loop) then the outer loop automatically advances after the inner loop has completed. If you need to break out of the inner loop pre-maturely there is usually a break command (or continue to skip the current inner most iteration)

In C you would say:

When(true){

Your code

}

When(false){

Your code

}

I don't know if this helps or not, but here you go.