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Advanced solution: By writing a user-written dynamic load model you can update the bus load at every time step. See Program Operation Guide, Chapter 21.9 for details.
Simple solution: If you don't need to change the load so frequently during the simulation you can run to t1, change the load with a load changing API, run to t2, change the load again, etc.
If you really wish to change the load every millisecond (I assume you meant millisecond and not microsecond!) you need the Advanced solution, :-)