You can optionally supply a help string for a menu entry.  A help string is text, usually slightly longer than the text of the menu entry, that describes the action performed.  It is displayed in a tooltip when the mouse pointer is positioned over the menu entry. For example:

newCM:-Entries:-Add( "Increment the integer", "%EXPR + 1", integer, helpstring="Increment the integer by 1" );

A submenu is a context menu that is launched by clicking an entry in a context menu. Submenus are useful for grouping together a set of related entries.

When adding an entry to the context menu module, you can specify that this entry be placed in a submenu by using the submenu option.

newCM:-Entries:-Add( "To String", "convert(%EXPR, string)",  Not(string), submenu=["Conversions"] );

The To String entry is placed on the Conversions submenu within the context menu system.  For more information, see ContextMenu[CurrentContext][Entries][Add].

You can group together related entries in the top-level context menu without placing the groupings in separate submenus.  This can be achieved using categories.

When adding an entry to a context menu module, you can specify a category by using a Maple string.  Entries in the top-level context menu that have identical categories are grouped together in the menu. A horizontal divider is drawn between entries of different categories.

Note: The category name is not displayed in the context menu.

Important: Categories can be used only in top-level menu entries, not submenu entries.

newCM:-Entries:-Add( "Factor Integer", "ifactor(%EXPR)", integer, category="Integers" );
newCM:-Entries:-Add( "Test Primality", "isprime(%EXPR)", integer, category="Integers" );
newCM:-Entries:-Add( "Floor",          "floor(%EXPR)",   {float, fraction}, category="Non-Integers" );

The Factor Integer and Test Primality entries are grouped together in the top-level menu, with a dividing line separating them from the Floor entry.