[Delta Dog]

You need to get at least a 12/3 WITH ground (preferably 10/3 WITH ground) wire to run from teh genny to the front deck. Hook up your 240v plug using all 4 wires (2 hots (red/black), 1 neutral (white) and 1 ground (bare)). When you get to the front you can divide the 240v into several 120v circuits. Each 120v circuit has its own hot and shares the neutral and ground. So one circuit/switch has red, white bare and the other has black, white, bare.........just jump the white and bare wires from one box to the other.........but only ONE hot wire (red OR black) per each circuit.

 

[Delta Dog]

Feel free to correct me if I'm wrong, I'm NOT an electrician by any means, to run 240 will you not neEd a 4 wire cord such as 12-4 or 10-4, to carry the hot, hot, neutral, ground run to the front and then split like everybody said. Not trying to be smart, I ask questions all the time, just don't want somebody waste the money on an extension cord that might not work or worse get shocked, might be wrong, won't be the first time. I'll be wiring my new lights up when they get here

Delta dog after re reading your post thatlooks like what you were saying

Correct.........a 10/3 WITH ground is a 4 wire cable (2 hots (red/black), 1 neutral (white) and one bare copper ground). You could also get a 10/4 WITHOUT ground (still a 4 wire cable)..........I just like to keep that ground wire bare............easier to keep things straight in my head if you stick with the basics of wiring.