Sharepoint Designer 2010 - how to add a second data source or other solution to get the desired effect

I modified a DispForm page and have set it up the way it was requested.
The current data source used for that DispForm page is filtered to show only the pertinent info for a row.
All well and good however I would like to access that same data source being used from the aforementioned and pull off row data( items that are related to the page - same category ) and add them as a row on the bottom of the page.
How do I  do that?
Add anther data source. Can't use the current because it is filtered already for the page.

Thank you Experts in advance.
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** I just remembered that SPDesigner 2010 still has the "Design" view.  In this case, please use the "Code View" to edit **

Why can't you add another data source?  
SPDesigner is very picky about where your cursor is placed in the document. Make sure your cursor is located in the correct context.
Your idea is to create a little window at the bottom that is not really related?  Can you put your cursor right before the closing </ZoneTemplate> and then try inserting a Data View of the list you want?  From there you should be able to trim down to get what you want

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