you can apply a clipping mask to a layer group:
Stacking Layer Masks with Groups
There are many situations in which it would be useful to apply more than a single mask to a layer.
For example, you may want to preserve the hard edges of a mask, while further adding to the already masked area with soft brushes.
Simply adding a second Layer Mask won’t work – Photoshop will create another Mask, but it will be a Vector Mask, which you can’t paint on.
Instead, here’s what you can do:
Place the Layer within a Group
Apply a Mask to this Group
You can keep stacking this infinitely. if you need another layer mask, just put the group within another group, and put a layer mask on that!
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