Is there a method to achieve this:
to hide under-cabinet lighting, without having to apply a molding to the bottom?
Like Michael I usually just note it- I also add a CAD detail as typical.
IF you really must make one in a frameless cabinet in CA here is one way-library with example attached.
A framed cabinet will have an appropriate recess.
edited to add-note that it will be incorrect in the cabinet schedule since the height is cheated.
recess bottom wall cabinet.calibz