There isn't a way to create a user defined layer in cell editor local to the design or the Library cell editors.
However, you do manage them in the Central Library on the main menu --> Setup>Setup Parameters and under the User defined layers section you can create any user layer you like.
I have also attached a screen shot of an example where I created a specific layer called "dimension".
Hope this helps!
UserLyr_Central_Lib.JPG 76.3 KB
Thanks a BUNCH!!!!! That's what I needed!