I am trying to convert my garage, and the garage door wall has a header on it. I am trying to frame a wall with a rough opening for a window and was wondering how I would fit the king studs, do I build a new header underneath or just have two jack studs?
Walls – How to frame a rough opening on an existing header
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Related Solutions
1 king and one jack per side, assuming it's not an unusual load above. If your header has space above, make the jack continue up to the plate.
Only caution is that even though the 6" fill looks good on paper, the slightest fatness in your framing materials coupled with a tiny bit of "out of plumb", might mean your door is a tight fit. Buy the dryest 2x material you can find.
That 2 x 12 is over engineered. I'm guessing this is an older house, built when large dimensional lumber was much cheaper.
First, See this question Proper size of header to support new door in load bearing wall?
It looks like you can conservatively get away with 2 2x6's on edge for the header, and some cripple studs to fill the empty space (Ignore text on img) - 
I'm still trying to figure out how you're getting four inches in there without moving that wall stud at the far right of the picture.
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Best Answer
It depends on the window size to some extent, but typically I'd not add another header. In fact, some carpenters put all headers against the top plate, with pin studs down to the RO.
Just drop your studs in and build down (if necessary) by whatever means is convenient. You always want at least two members along a door or window for rigidity, curtain backing, etc. Tie it all together well with sheathing and be happy.