I can’t remember one spinoff done under similar circumstances that lasted more than a couple of seasons. I guess the 100th times the charm.
JAG to NCIS to NCIS LA to NCIS NO
All in the family to The Jeffersons
All in the Family to Maude
The Big Bang Theory to Young Sheldon
Different Strokes to Facts of Life
Happy Days to Laverne and Shirley
Soap to Benson
Cosby Show to A Different World
Buffy the Vampire Slayer to Angel
Mary Tyler Moore to Lou Grant
Law and Order to Law and Order SVU and Law and Order Criminal Unit
Chicago Fire to Chicago PD to Chicago Med
Cheers to Frasier
I am sure there are ton more, but I can’t think of them at the moment.