In the 3D building environment of FlexSim, how can you define a parent model and within that parent model, you can build up all the details? Example would be in parent level, I just want to have 3 processors, Body, Paint, GA, then under each processors in Child tier 1, I add line detail for Body, Pain, GA, then under line in Child tier 2, I add more details. I have seen this feature as a standard offer in tools like Simul8.