Attachments in Demantra

I would like to attach a document to a Promotion / Settlement invoice in Demantra.

This I would like to create as an URL rather a physical document.  I am thinking of storing the document in sharepoint and give this URL here.

This is like a similar functionality where in FND Attachments in Oracle apps where i can select URL option.

Can i create an series of type URL or string where the data in that series column shows as Hyperlink and user can click on it.

Any suggestions is highly appreciated.

Thanks in advance.

Regards,

Kumar.