Hello folks, I need your advice on how you conduct townhouse design workflow. I'm designing 18 townhouses with different elevations (something similar in the attached image). Till now i have created different townhouses in separate files. And all townhouses besides eachother has different elevations.  What would be best workflow for putting all townhouses together on site model? I tried grouping one townhouse but when i explod it forgets the layers and messed up. (Probab