Power comes into switch box on 12/2 wire. Connects to 3-way switch. Run 12/3 to first light, then 2 x 12/2 to next light, same thing for three more lights, then 12/3 to 3-way switch. See this link (http://danswiringpage.com/diagrams/3w3lt_ps.jpg ) for the specifics on how it was wired. This part works fine.
What I want to do is continue the power on through the last switch to feed another light system (switch and two more lights; not 3-way). How can I do this? It seems that I would need to replace the last 12/3 with 2 x 12/2, so I can continue a neutral. But that doesn't seem right to me, or even like it will work.
Does anyone have an idea on how I can do this?