organise plug-in the same component palette (multiple plugiin in the same same "EXtra"menu)

hello,

i would like to group several plug-in in the same component palette.

For example i would like to group anemaon plugin in the extra menu, and horster camera control in the same compoent palette .

Like Elk, generator and hoopsnake .

In one sentences : How to put multiple plugi-in in the same  "Extra" menu

thank you.

Ludo