when using the above Image Enhancement it is recomended that a persom use Smart Ohjects! Why not just a new layer on top of your Photograph?
If you use a SO then the S&H adjustment will be stored as a Smart Filter and the advantage, as with any SF, is that you can subsequently tweak as many or as few of the the controls as desired instead of starting from scratch.
Ok, but my question was really can't you just put a new layer on top of your photo and apply an adustment without using a Smart Object? Seems like it would be much simpler as well as a smaller file!
I'm surprised you didn't just try a regular layer and discover the answer to your "real question" is yes, without starting a thread in the forum. Seems like it would have been much simpler as well as a smaller waste of your time and mine.