Two Different Addresses In The Navigation Pane?

I have a report with a Matrix table. When it€™s fully populated I have 5 rows. These rows are different categories in a CRM system. In these categories there are a lot of Opportunities listed. The thing here is that category 1-4 exist in one table, really a view, and category 5 exist in another different view. So to gather all the information into one single Matrix table to later have subtotals and stuff I just made a little Union of the two select queries.

Now one the column in the table is of course Topic. And from here my client wants to be linked to the right CRM card. The problem I have encountered is that how can I have to different addresses on one single cell in the table?

In the Navigation pane in the cell that corresponds to the Topic, for now I have an address like this:
=string.Format("http://{0}/SFA/opps/edit.aspx?id={1}", Parameters!srv.Value, Fields!objectid.Value)

What I need to change when it€™s a category 5 Opportunity is €œopps€? to €œcat5€?and add €œ&etc=10008€? to the end of the address. Any ideas?

PS. {0} and {1} are parameters, one server parameter and one opportunity ID parameter.

Kind Regards