In a typical comedy block airing from 8-10 the shows airing at 8:00 and 9:00 are the anchors and are expected to do better than the shows airing at 8:30 and 9:30. But there are exceptions where either the anchor underperforms or the :30 show exceeds expectations. New episodes building on repeats don't count. some examples

Parks and Recreation builds on Community.
The Middle built on Hank.
Two and a Half Men built on The Crazy Ones.
The Michael J. Fox Show started out building on Sean Saves the World.
Carpoolers built on Cavemen.
2 Broke Girls built on How I Met Your Mother in its 1st season.
Suburgatory built on The Middle in its 1st season.
Will and Grace built on Caroline in the City.
Brooklyn Nine-Nine builds on Dads.
Scrubs built on Father of the Pride.
Friends built on Mad About You.

"Two and a Half Men built on The Crazy Ones" -- A veteran show building on a new show?

A historical case: in the 1975-76 season, new midseason replacement Laverne & Shirley built on its lead-in (and parent show) Happy Days (L&S ranked #3 in its first season, while HD ranked #10 in its third season)

"Two and a Half Men built on The Crazy Ones" -- A veteran show building on a new show?Two and a Half Men is an aging veteran past its prime, nowhere near the highest rated sitcom anymore. The Crazy Ones had excellent premiere ratings and started out higher than Men but has steadily dropped since then.

Big Bang Theory built on How I Met Your Mother in its first season.

Friends from Seinfeld - during 1995 May sweeps and Hope & Gloria from Mad about You.

Roseanne built on Who's the Boss (1988-89)
Home Improvement built on Full House (1991-92)
Designing Women built on Murphy Brown (1988-89 and 1989-90)
The Wonder Years built on Who's the Boss (1989-90)
Empty Nest built on Golden Girls (1990-91)
A Different World built on Cosby Show (1990-91 and 1991-92)
Malcolm in the Middle built on The Simpsons (1999-2000)
Rhoda built on Maude (1974-75)
M*A*S*H built on Good Times (1974-75)
Phyllis built on Rhoda (1975-76)
One Day at the Time built on M*A*S*H (1975-76)
The Lucy Show built on I've Got a Secret (1962-63 and 1963-64)
The Andy Griffitth Show built on The Danny Thomas Show (1962-63 and 1963-1964)