Hi I found where this question has been asked before but I am not sure if this has changed with 4.8 because the options no longer seems to be there. I am importing fbx files from 3dsmax that were revit files (Architecture) and would like to set all of the meshes “Collision Complexity” as “Use Compl…

Did you try, when you select all the assets you want changed, right click one of the meshes then go to Asset Options>Bulk Edit via Property Matrix or is this not the problem?