From what I heard from a friend of mine who is on the CIF basketball tourney board:
1- Each section will rank all of their "automatic qualifiers" for Nor-Cal regional in order of best to worse. Auto Qualifiers are the 4 teams that reached the Semi-Finals. So that will mean 4 teams per division, per section. (unless section has rules to only submit 2 teams)
Auto Qualifiers vary from Section to Section.
Oakland and San Francisco Sections have 2 Auto Qualifiers. These teams will probably be put in the Divisions 3, 4, & 5.
Northern Section has 12 Auto Qualifiers. Division 3 has 2 Auto Qualifiers, Divisions 4 & 5 have 4 Auto Qualifiers, and Divisions 6 & 7 have 1 Auto Qualifier. At least, that is how I think they are assigned, I could be wrong.
North Coast Section has 24 Auto Qualifiers. 4 for each division, with additional teams for teams promoted to the OPEN Division.
Sac-Joaquin Section has 22 Auto Qualifiers. 4 for divisions 1, 2, 3, 4, & 5, with additional teams for teams promoted to the OPEN Division. 2 Auto Qualifiers for Division 6.
Central Coast Section has 20 Auto Qualifiers. 4 for divisions 1, 2, 3, 4, & 5. C.C.S. OPEN Division teams take 8 of these Auto Qualifiers. After those teams are decided, this season here is how the rest of the Auto Qualifiers are assigned.
Division 1 Section Champion and 3 teams from OPEN Division (CCS could replace Bellarmine, after they are selected for the OPEN Division, with the Runner Up team.)
Division 2 Section Champion and 3 teams from OPEN Division
Division 3 Section Champion, Runner Up, and 1 team from OPEN Division (CCS could add a 4th team, if they wanted to)
Division 4 Section Champion, Runner Up, and 1 team from OPEN Division (CCS could add a 4th team, if they wanted to)
Division 5 4 Semi Final teams.
That is 79 to 82 teams.
There will be 6 to 9 At Large teams selected.
Here are the teams I propose apply for the At Large berths;
Lincoln (Stockton)
Piedmont Hills / Los Gatos if either team loses in the Semi Finals or the Championship game
Amador Valley
Sacramento
James Logan
Woodcreek
Monte Vista (Danville)
then 1 or 2 other teams will get in thru the At Large process.