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Hello my name is ***** ***** to Just Answer. Are you looking to install a new switch and new lighting? And you were hoping to grab power off an existing 3-way switch?
Ok, and that is already existing? 14/3 to the 3 way and 14/2 to the single pole ?
Ok, so it's just a 3way switch in this box ? no other wiring?
Ok. How many lights are on the entire circuit? Any receptacles on this circuit also? How many new lights are you looking to add?
Ok great. Do you have the new 14/2 run from the switch to your first light already?
Ok. Where are you working? Are you able to get at the existing lighting/wiring ?
You cannot add a new switch and lighting just on to that 3-way, as you only have switch legs and no neutral.
How old is the house?
Ok cool. So yeah in that 3 way the red and white will be your travelers and the black would switch back up to the lights.
Yes, you can just add a 2 wire to your jb and take the hot thru the switch and continue the white and switch leg to your new lights. You're welcome. Have a good weekend.