public String getParentMenuGroup() {
		return parentMenuGroup;
	}
Returns the group for the parent menu of the menu item created by this data.   That is, 
this value is effectively the same as {@link #getMenuGroup()}, but for the parent menu
item of this data's item.   Setting this value is only valid if the {@link #getMenuPath()}
has a length greater than 1.

@return the parent group
Ghidra/Framework/Docking/src/main/java/docking/action/MenuData.java