Creating new materials in Fusion for simulation is very cumbersome. Copying one material properties to another is dangerous because if you do not remove all material properties you don't update, then you will have incorrect material properties entered into your database (ex. if I only need stress properties for a non-linear simulation, and I copy a material that has thermal properties in it - I will need to zero out all the thermal material properties or else I will have erroneous data for that material in the database for that material for future simulations.
A simple "customer defined" material property for simulation - where is requires the user to enter in only the required properties for that type of simulation is needed. Then also make it simple to add this data to the custom materials library. This is the same method that is done for Simulation Mechanical.