It would be nice to be able to grab a few parts in the model tree and to be able to quickly hide everything else. This is very helpful when assembling new parts into an assembly with many parts. I know that Creo can do this by creating layers, adding parts to a layer, and then isolating the layer. This process can be very tedious and it takes many more clicks than other software (i.e. solidworks, edrawings). And if that can't be done, it would be nice if a new part that you are trying to assemble came in on the isolated layer. Currently, you have to add the new part, then add it to the layer, and then you can isolate it. Very time consuming.