Cloning to ALL Layers From Global Source
This took a bit of tinkering to figure out after seeing the post about "Source: Current Layer" options. What we're all looking for isn't the options in that menu but the button beside it which is "Add Global Source" and click on the source when the new list pops up with the source in it to make sure it's selected as a global source. Then and only then will your current layer source end up carrying over to other layers. Without this button it will just copy what's on the same layer only to keep it on that same layer.
For example, copy a tree from layer 3 to clone TO layer 5, it will only add what's been cloned to layer 3 and if you chose layers below it will only put cloned from 2 on layer 2 and only put cloned from 1 on layer 1.
None of the cloning goes to another layer than it's source no matter which menu option is chosen without pressing Add Global Source and selecting which one(s) you want to be global.
I've just now also noticed that after you add a global source the word "Global" appears in the options at the bottom.