You need to figure out how much load it will be carrying. Carry the load directly through
the floor system below, as Bob said.
Yes, a few instances. A Simpson: HUC412-concealed flanges hanger would work, with nails. (2400 lbs.)
Or, a Simpson: HUCQ hanger works, with special screws. (-5000lbs.) http://www.strongtie.com/products/co...C-HUCQ_SCL.asp
With both you need a 4x4
to act as the king stud. So, if you cut the walls back for posts, easier to cut the kings off to make them trimmers, and run the header to the next studs back. Be safe, GBR