In that SQL report, there's a "where" clause which is what filters the report to what exactly you want to see. In the report you linked, this is the filter:
Where tblAssetCustom.State = 1
This filter will only show you active assets. If you want to hide assets by name you can change it to this:
Where tblAssetCustom.State = 1 And tblAssets.Assetname not in ('Server1','Server2','Server3','Server4')