Swich question for existing lights

Hello - I have a question that I'm hoping someone could assist with.

My current setup is that I have 2 lights (A and B) in one room that are just pull string lights, no wall switch. There are 2 addidtional lights (C and D) that are in a different room but are on the same line, just downstream.

I installed a light switch with the intent to be able to control lights A and B. from the wall switch, I ran a line to Light A. I tied the power coming into Light A with this line from the switch. So now my power is broke at the switch. The switch works, but it controls all 4 lights. This makes sense to me because they are all on the same line.

Is there anyway to seperate out just Light A and B so that this new wall switch controls just these and not the other 2 lights (C and D)? Lights C and D have their own seperate switch. I only have access to the wall outlet and switch as the walls and ceiling have been drywalled and painted.

Thanks in advance for any help.

 

What wiring method was used between lights A&B. Is it cable or is it raceway?
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Tom H

 

You need to get an extra cable from A to wherever the cable from B goes to. This will allow you to continue unswitched power past B. If there is conduit between A and B, you can just run one more wire through it to accomplish the same thing. Or if you can replace the 14/2 between A and B with a 14/3, this would also solve the problem.