Wait, is 7x10 regional or based on legacy leagues? You can't really have both and I shudder to think how awful a Northeastern Division would be.
You need to learn how to use the reply function.
7x10 would primarily be Legacy with regional tweaks as required.
Here's the optimal 7x10 configuration as proposed by the Athletic with one change I made (keeping UCF in the Big East):
Big East: Miami FL, UCF, VA Tech, WV, Louisville, Cincy, Pitt, Syracuse, Rutgers, BC
ACC: Maryland, Virginia, UNC, NC State, Duke, Wake, Clemson, South Carolina, GT, FSU
SEC: LSU, Ole Miss, Miss St, Bama, Auburn, UK, Tennessee, Vandy, UGA, Florida
B10: PSU, Ohio St, Michigan, Michigan St, Purdue, Indiana, Illinois, Wisconsin, Iowa, Minnesota
SWC: Arkansas, OU, OK State, SMU, BU, TCU, Houston, Texas, TX A&M, TT
B12: UU, BYU, CU, Colorado ST (or Boise St). KSU, KU, NU, Mizzou, ISU, Northwestern
PAC: Washington, Wazzu, Oregon, Oregon St, Stanford, Cal, UCLA, USC, Arizona, AZ State
Notre Dame and anyone else who wants in this Division are indys.
7 conference champs and top seeded at=large host 1st round CFP games in 16 team format. Teams are re-seeded after 1st round for quarterfinals at bowl venues the 3rd weekend in December. Semis are on NYD with championship game 7-10 days later.
G5 has separate 8 team playoff with their championship game in the first window on NYD.