SubstantialElk6 ,

We were trying with 'from task' at the moment. But the question apply to all methods.

You can specify this using add_function_step(..., execution_queue="<QUEUE>")

Make certain tasks in the pipeline run in the same container session, instead of spawning new container sessions? (To improve efficiency)

I'm not sure this is possible currently. This could a be nice feature request. Maybe open a github request?