Hi & welcome!
There are some before/after examples of trimming & repotting umbrella plants (a/k/a Schefflera) in this discussion:
The thread "What do I do with these leggy Schefflera's?" in
Houseplants forum
It can be more trouble than it's worth to try to keep an older, trimmed trunk as a houseplant. It can be more enjoyable to trim off the fresh, young tips, stick them in a new pot, and once you are sure they have taken root and are growing well, forget about the original plant. If all you really want is a pot of pretty leaves at a reasonable height, that can be an easy method.
