Cloth re-bake (or 2 cloth sim)?

Is there a way to re-open a cache to extend the end frame of the simulation with the same parameters (it is on disk) so I don’t have to recalculate the start of the simulation?

What about having one cloth simulation and then another after a certain frame on the same object? Is the solution to create a new object or can I run 2 cloth sim on 1 object?