Within the Map Editor, you refer to a menu by its database, mapset and menu number. The database and mapset have the usual meanings. The menu number represents the menu you want to open, create or delete. Although it refers to the whole menu, this number is the number of the map holding the menu bar, while the immediately following numbers are used for the map numbers of the pulldowns from left to right. For example, a menu numbered 4 with three pull-down menus is stored in four maps, numbered 4, 5, 6 and 7, where map 4 holds the menu bar and maps 5 through 7 hold its pulldowns.
To be more exact the map number of each pulldown formed by adding the option number of the option in the menu bar that opens the pulldown to the the map number of the menu bar itself.
This means that you have to be careful when editing or creating a menubar in an existing mapset, as is explained next.