Just managed to remove it by deleting the relevant entries/records in Setting->Technical->Menu Items.

Hello

You are talking about menu shortcut which are listed in below user icon in side corner of web interface. Suppose "Quotation" menu shortcut is added in that list. for remove this link just open "quotation" menu and In right-corner of Form. you may find this [] icon in yellow color it means it pressed already so just press [] this icon and un highlight it.

Now you can see this custom shortcut list in below user icon. It will removed

For find more information about how works menu shortcut jump to this link

maheshwarimayur.blogspot.in/2012/12/create-menu-shortcut-in-openerp-v70.html

Hope this will helps you :)

Thanks