Blocks are joined via an "Include" command.

Here is an example that shows that the "UI" block is expanded by blocks "UI_Basic3d" and "UI_Nat3d". In other words the keys of the "include" blocks are also used.

[UI:include(UI_Basic3d,UI_Nat3d)]

In addition, the include command can also be combined with rules from categories so that the menu can be composed of "modules".

[UI(3d):include(UI_Basic3d,UI_Nat3d)]

[UI(2d):include(UI_Basic2d,UI_Nat2d)]