That didn't really help-
Your best bet is to hire a structural engineer to evaluate the current condition and propose the appropriate alternative.
And another thing to think about- do you want this to be a drop beam or a flush beam (in other words do you want to see the beam, or do you want it hidden within the floor system)?
Contact:
Nebojsa "Neb" Mrdalj, PE
Structural Engineer
neb@smandf.com
(757) 427-1020 t
Office extension #336
(757) 392-0337 m
Virginia Beach Structural Engineers Speight, Marshall & Francis, P.C