Columbia Pictures was never related to Columbia Records.
Columbia Pictures had Colpix (Nina Simone, Woody Allen, Dick Gregory, so), which then became Colgems (The Monkees).
After Clive Davis got fired from Columbia Records, he was hired on at Columbia Pictures (as a consultant) and then to Bell Records (as president). Columbia Picture had recently bought Bell.
Davis was looking to get this beast all under his control, and the Bell name was changed to Arista.
Barry Manilow began on Bell, but soon was on Arista. Same with Melissa Manchester.
Alas, The Fifth Dimension did not make the transition. They had good hits on Bell, though!
And yes, this was the same Bell that had The Box Tops. The label was around long before that, too!