Making shortcuts on toolbars

I would like to add programme shortcuts to one of the toolbars, preferably the Office one but it's not critical. Poor old Opus is a bit of a bloated monster and despite Help searches and experimenting with the Customise option I can't seem to make it happen, yet I'm sure it can be done, other file managers have it and it's a simple drag 'n' drop there. Any suggestions anybody please?

http://www.gpsoft.com.au/help/opus10/default.htm#!Documents/Editing_the_Toolbar.htm