You can use a static 'webjumper' link that will go directly to the project workspace or an individual document or report specfied in the link.
All you need is the WS number or the Document ID.
The format of the webjumper link is:
https://mycompany.ariba.url.com/Sourcing/Main/ad/viewDocument?ID=WS12345
Where
mycompany.ariba.url.com is your specific system url
WS12345 is the specific project workspace or report DocumentId found using View Details