As a fabricator I've been given detail (notes only) for multiple sized WF beams w/moment welds to a HSS column with procedure noted as cut, add continuity plate, splice col. however multiple sized beams seems to make this crazy to me
It will be an expensive detail, but I think the EOR wants multiple through plates, one at the top flange of all of the beams, and one at the bottom flange of each beam.
It seems a little crazy to me too. Hopefully there's a good reason for it rather than just optimizing beam weight at the expense of connection cost.
If you have the latitude to do so, it might advantageous to shift the locations of the splicing around to be better suit fabricaton. See one option below. This, admittedly, probably make the column less friendly to ship.