In the original post you mention wanting to know how to do this in BiaB. The short answer is you can't, at least not how you describe.

As mentioned by others; try Realband. Generate your basic structure in BiaB, then open the same file in Realband (you probably have it included if you have a version from the last 12 years).
Then you can copy/paste what ever sections you want to another track easily (to save them and use them when you want). As an IT guy you may even like it's flow better. I do.

You can whittle down and generate just sections of any track(s) you want to. You can choose to leave the blue tracks as BB tracks so they generate every time or make them regular tracks so they only regenerate when you tell them to, different options and different workflow, but many of the same features.

A few people mentioned using a DAW; Realband acts much more like a DAW but retains the BiaB generating features. This is big for some people.

Make your sound your own!
.. I do not work here, but the benefits are still awesome