We're remodeling our kitchen right now and part of that remodel is going to involve moving our sink to the right by about six inches. Is it okay to just add some more pipe to reach the new sink drain or should I re-do the whole line from the floor up?

Outside of the occasional toilet valve, I've never really done any plumbing before, so I'm new to this--but I've got to do it myself regardless (it's well outside the budget to get a plumber to do this for us). Thought I'd come here for some advice.

Anything you've got in the way of instruction would be greatly appreciated. Danke!