Hi, in my mind, you do need to rebuild model when parameters are related to geometry or mesh. Maybe the functionality “parametric sweep” can help to take this work quickly. You can refer to blog: https://www.comsol.com/blogs/efficient-parameter-control-and-usage-in-comsol-multiphysics?setlang=1
Please contact us if you have any further questions: //www.co2jys.com/support