How to move custom_menu items to pre-existing menu items

Hi there,

I have created a custom menu i.e Main Menu..by below following script-

procedure(Menu_CIW_TOP()
ciwMenuInit()

menuItem_11=hiCreateMenuItem(?name 'item11 ?itemText "ITEM 11" ?callback "f11()")
submenu1 = hiCreatePulldownMenu( 'Menu_CIW1 "Menu1" list( menuItem_11 ) )
slider1=hiCreateSliderMenuItem(?name 'slider_CIW1 ?itemText "Menu1" ?subMenu submenu1)
menu_ciw_top = hiCreatePulldownMenu('Menu_CIW_TOP "Main Menu" list(slider1))

hiInsertBannerMenu( window(1) menu_ciw_top 9)
)
Menu_CIW_TOP()

Now i want to move "Main Menu" custom menu item to "Solido" menu item in CIW.

so that when the click solido option , "Main Menu" option appears in it and then i will able to select according to it.

How can i acheive it??

Regards,