Duplicate objects in a layer?

@MrJeffreyGee
Have you realised that you have responded to a Thread that is a couple of years old?
I got really excited reading about the:

Coincidentally the above quote seems to state on the right 8h ago as does your Post, and this has often mislead me in the past. The latest Post Time/Date resides in this position regardless of the Thread scrolling position, it remains visible as if pertaining to all Posts. The actual Date difference is not so clearly defined but the earlier reference is from August 2016 while yours is October 2019.

I am unsure what you are regarding as a Layer feature within Transform.
Perhaps by Layer are you referring to Construction Plane(s) [CP]?
If you are referring to CP, is is available via Add > Construction Plane and you may be interested in:

How to move a sketch into a different folder