[Arild]

Omnifocus is not quite constructed as a collaborative/project management tool. For that, the Omnigroup has the software Omniplan that I recommend you check out. As for Omniview, I have never used it, I thought it was a tool for working with SQL-data.
If you have a more specific outline of the workflow you intend to perform with Omni-products, I am sure someone in the forum can share their experiences. There is also a separate forum for Omniplan.

If your needs are basic, there is always the possibility to export an Omnifocus project to a .csv, open it with Excel, Numbers or any other spreadsheet software and fill in any custom columns you might need (although you will not get that info back into OF, of course). Just press Cmd+Alt+E or use the "File" menu in OF and it will create an export of the active window. You can then keep a short cut to the spreadsheet under the project header in OF, for example. Just drag the file onto the element where you wish to place it.