Xfce multilevel menu

I want to organize my Xfce menus better. For example, I have a lot of entries in the “Education” category, to the point that the menu became scrollable in order to accommodate them all. What I want to do is group some of the menu entries into separate sub-menus that still reside under “Education”. I did not find clear instructions, so what I will describe is based on inspecting the sub-menus created by Wine, as well as trial and error.
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