In commercial construction, any modification of this type generally requires plans which have been stamped (meaning the design has been analyzed and approved) by a structural engineer, and I think (the internetellegentia can correct me here if I too far off) that your building permit will require this drawing.
The previous two comments were right on. Have someone who knows what they are doing analyze your situation, and have someone who knows what they are doing intall the mods.
I have a pool table in my basement, and I have a short cue for the unusual shot where my column interferes. A lot cheaper!