Why do you want to move it? It has practically no impact at all.
Anyway, if you want to move an entire model to a different layer, I think you can just modify the <Layer> property in the model descriptor file with a text editor. The property is a number, I don't know what number corresponds to which layer. But you can find it out in one minute by creating a dummy model on CUS layer and looking what number it has in the <Layer> property in the descriptor file. Then delete this temporary model.
If you want to move some objects, create a new model on the correct layer, and copy-paste the objects in file browser from the old model to the new model (in AOSService/PackagesLocalDirectory). Then build first the old model, then the new model, and do a db sync.
It will not change any functionality or break any data, assuming you don't have any overlayering code in place. If you do, my suggestion above doesn't apply at all.
