How to cut a hole using exicting sketch up through 1mm off of a surface?

Hi,

I am trying to create a  hole from a sketch ( I named it " HELP ")  down to the Red color surface ,but I dont want that to go through I want it to stop at 1mm off the red surface.

I tried to create a offset surface from the Red part but It can't be built for some reason.

I appreciate any help

Thanks

Alex

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