You can create a dynamic asset group under Configuration\Asset Groups. Use the "scan server" filter to have assets automatically added to a group based on the scanning server that last scanned them.
There's a built-in "Scanserver Assets Overview" widget as well that you can add to your dashboard. It allows you to quickly see a list of assets scanned by a specific scanning server. In reports, use the tblAssets.Scanserver field to determine which scanning server scanned an asset.