I guess I could ask in the Opus 12 forum, but as I'm using 13 
Currently I'm using FileMenu Tools for such a list
Hardkorn showed these images
So I assume it is possible.
Do you want a list of unrelated destinations, or a list of directories below a particular folder, or something else?
button GO D:\ FOLDERCONTENT=nofiles,copy
as first item in a menu button
Well, this screenshot might help me explain it.
If I right-click a file, a list of the directories as shown in the screenshot should appear, except the first 5 folders.
The FileMenu Tools list has 2 categories: DAZ and NAS. Depending on which category I select, the list of relevant folders gets displayed. The screenshot in the first post shows the NAS folders.
Try this in a menu or context menu:
GO "F:\_Content" FOLDERCONTENT="copy,nofiles,dirfilter=~(_*)"
Please forgive me for being dense, what is the menu? I've done some searching, can't seem to find anything.
right-click on a toolbar and this menu appears
Then just put a new button as the first item in the menu with the code @Leo gave above
If you want it in the context menu for files, go to Settings > File Types, and then the places shown in the screenshot you quoted from the other thread:
I must be missing something, I can't see that in 13.
Menu vs Context Menu, how do they compare functionality wise?
FileTypes - should be in 'Settings' on Menu bar, if not it can be dragged from the default toolbars found in the customize dialog
Thanks. However I meant the first screenshot, to create a new menu.
ahh, then right-click on the titlebar or on a blank space in a toolbar and select customize.
Thanks for your time. I did, and I don't get the first screenshot. This is what I get
I don't see an option to create a new Menu itself.
new menu will be in the right-click menu (yes again, another righ-click menu) that you will get when right-clicking on a toolbar (or an icon in a toolbar) in the main window/lister (after you have gone into cusomize mode), should look something like this
default toolbars with the default Menu toolbar is here, you can drag & drop items from there to your toolbars.
Found it, thank you. It's well hidden 
I've decided to go down the Context Menu route. For some reason it isn't working, I must be doing something wrong.
Firstly I created a sub menu, and added the command to that
Right-clicking a file displays the sub menu, but nothing happens when clicking in the white space.
That folder is empty though. You're asking Opus to display its subfolders but it has none.