You can save the results of a 3D simulation to use as a starting point, to save calculation time during subsequent simulations.
To save the current simulation results to use later, select Home tab > Simulation panel > Results > Save Simulation Results.
To use the current simulation results as a starting point, select Home tab > Simulation panel > Results > Use Results as Starting Point.
To clear the simulation results, select Home tab > Simulation panel > Results > Clear Starting Point.