Same mask inverted in new layer

Hi All, This is probably simple, but not for me. I have an image with one person and background/foreground. I made a layer mask with overlay blending for the person. Now I want to make a new layer with multiply blending for the rest of the picture.

I found the menu with add and subtract but I cannot get the steps or sequence down for this. I need instructions for really slow people.

Thanks
MAS

Click on your original Layer Mask.
Hold down the Option key and drag the Mask to your other Layer (to copy it to that layer). Click on the copied Mask and Cmd i to invert it.

Thanks Ann.