How to crop pixels based on layer blending?

So I have a black and white layer that I want to use to mask/crop specific pixels out from the original image. How do I do this with layers? I’m trying with multiply by putting white pixels where I want to crop and black where I don’t but then the final blend the black I don’t want. Masking with rgba 0,0,0,0 just keeps as well.

It seems I’m looking for a “dissolve” blend mode

Hi @jest, I think you are referring to mask/clipping layers: Layer mask for color and transparency