I’m not entirely sure I understand, but is this what you mean?
You can embed other notes inside notes. This is also called transclusion in Obsidian. If you use this syntax, it will embed that note inside your current note.
![[note title]] or ![[note title#header]]
![[Apple Recipes]] - this will embed the note.
![[Apple Recipes#Apple Pie]] - this will embed one section of the note from the header “Apple Pie”
That way, if you want to include a MOC inside another note, you could. Or you could add that other note inside your MOC. I wasn’t sure what direction you meant.