You can name a system whatever you want. For compressed air, you'd likely defer to the System Type of 'Other' for the definition of the connectors... however, when you actually create the system, you can name it whatever you want. This can be done a few different ways, but perhaps the most straight forward is to right-click the system in the System Browser (In this case, 'Other 1'), Select Properties..., then for System Name, rename to 'Compressed Air'.
Once this is done, all interconnected pipe segments, fittings, and accessories will inherit this system name. Thus, you can use View Filters to filter based on system name to only display the pipe components as appropriate for a particular view.
HTH,
MS
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.