And remember that the layer masks can not overlap or a gradient layer can't come in contact with a layer where you made a WB adjustment. If you do, the newer layer (the one on top) will not work right and show a strange effect of hue. This also true with the local color adjustments in a layer, they can't over lap.
In LR you can do this with various adjustment brushes, but the LR individual color adjustment process is not as straight forward to me as in C1, and I do wish C1 would come along with a way to allow it also.
Paul