How to convert a color fill layer into a mask?

Question

I created several color fill layers that I thought were layer masks, is it possible to change it to layer masks?

The color fills are silhouettes, so a basic shape that looks like a layer mask. any direction is appreciated.

Answer 1

Command/Ctrl+click the layer thumbnail in the Layers Panel.

Highlight the layer you want to add a mask to in the Layers Panel.

Click the New Mask icon at the bottom of the Layers Panel.

Turn off the visibility for the layer with the shape.