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Which version of ePO are we talking about? Assuming it's 4 or 4.5, then the easiest way would be to make a duplicate of the query you're currently using and add a filter for the machine name you're interested in. You can then save this query should you need it in the future.
If it's ePO 3.6.1, then when you run the report it will ask you if you want to set any filters: answer Yes here, and then again select the machine name you're interested in in the relevant filter.