Jake and the Fatman to The City

Diagnosis Murder was a spinoff of Jake and the Fatman.

Diagnosis Murder's Dr Mark Sloan was defended by Matlock when Sloan was accused of murder

All My Children and Loving feature the fictional Trans Global Airlines

All My Children and Loving crossed over a number of times.

The City spun off of Loving survivors of the Corinth Serial Killer leave Corinth to an apartment building in NY SoHo