Originally posted by: Perth2

I use CPLEX with Java in a column generation context. I have a restricted master problem (RPM) that I add columns to and that I have to solve as an IP at regular intervals once columns are added.

Is there any way I can limit the next (or reuse the previous) branch-and-bound tree (or similar) if I have an existing IP solution and have only added new columns to the model, so CPLEX won't have to start the B&B all over?

No, there is no way. Since you changed the model the B&B tree of the previous solve becomes invalid.

The best you may do is remember the integer feasible/optimal solution from the previous solve and use it as a MIP start in the current solve.