Show All, Hide Service & Isolate Service
Within Revit under the eVolve Mechanical tab you have access to the Visibility tools which allow you to Show, Hide and Isolate services.
To Isolate a service, you would select Isolate Service in the ribbon, then click an item in the service or services you would want to isolate and click Finish.
To Hide a service you would simply click Hide Service, then click an item that is in the service or services you want to hide.
Lastly if you have anything that is hidden due to the Hide Service or Isolate Service options you can click Show All to bring everything back at once.