Can you have two wires soldered to the same +5 volt power supply on a pcb? Probably not right because then it would link the action to the other wire and transfer that to wherever the other end goes right?
Yes, you can. Chances are that they're all linked together by the PCB anyway. The only things you really need to look out for are:
1) Trying to draw too much current with a conductor that's too small. When in doubt, use thick wire and tap into the thickest point you can reasonably get to.
2) Tying too many chips to the same power supply point without sufficient decoupling; this is mostly a problem with high-speed logic/memory/processor chips; if you're not doing some fairly serious functional mods you shouldn't need to worry about this).
Probably not right because then it would link the action to the other wire and transfer that to wherever the other end goes right?
It's normal for supply pins/wires of the same voltage to be connected together. They provide no signal, so there's not really any "action" to link. They just provide the power and reference levels for the circuit. You could get noise into the system if you screw up, but that can just as easily happen with one wire as two or more.