[Yes, this was posted in the 'desk NG's earlier today - still looking for more answers]
Ok, I've watched the movie and read the book, but I'm still lost.....
How do you add a menu item to an existing menu header in a partial menu?
Right-clicking on the menu header gets you "New Menu" or "New Sub-Menu". Wrong. So I'm guessing you need to add a new command first, then drag/drop it to the menu?
If so, how do you create a new command that belongs to a partial menu? When you click the New button, it always adds the new command to the ACAD menugroup. I don't want it in the ACAD menugroup. This occurs even if the category "Custom Commands" is loaded under "Command List | Categories"
Good grief - I could have been done editing the MNU in the time it took me to write this.