actully Maya is best for that, since u can changw order in scene outliner, will give u exactly same order as u need, blender collada dosn’t really work for some reason, i still use obj most cases
if you want to have an order of stuff in your 3D scene you can give them a sequential name (with a prefix or a suffix) and process their names using assimp Node node. in your case getslice your meshes based on a sort’s former slice. watch out as a node can have multiple meshes, check that with the binsize of the mesh id coming from assimp node. i suggest using dx11 assimp nodes as they are the most maintained 3d importers in vvvv