Adding Menus and Sub-Menus to the Toolbar

Hi,
I would like to add menus to a specific Discipline Toolbar.
That is on the same Toolbar it can show either top tier Mechanical or
Structural or Piping or Civil - depending on which one is picked...!
Once the Discipline is picked, each discipline would have its own various sub-menus.
For Instance the basic sub-menus (that will be expanded upon when all is running OK) would be as follows...
Once of the Major Disciplines has been picked.....in this basic example Mechanical:
Discipline 1st Sub-Menu 2nd Sub-Menu Mechanical |_______ Geometry ______Lines, Shapes, etc. Blocks Equipment Notes....and so on.
What would be the way to construct this setup?
Any help or tips would be appreciated
Cheers
FG
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Always important to state which version of AutoCAD. Most helpful...

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