Welcome to Librarium Online!
Am I allowed to lets say shoot markerlights with a pathfinder squad and use those counters to fire skyray missles?
If I can, then can I use it to lets say hit 4 or 5 ddifferent targets at once assuming there are markerlight counters on 4 or 5 different targets?
Yeah you can shoot missiles from any tank with any markerlight hit.
So bringing along pathfinders and a skyray is a good idea because you'll be able to use your seekers a lot faster.
Assuming there are markerlight counters on 4 different units then you can fire seekers at all four units if you have enough seekers.