1. Go to Environment Tab and then click on Custom Datacenters.
2. Input the Name and Description you want.
3. Expand vSphere World.
4. Select the VDI vCenters you want.
5. When you run the report, change the drop down to Custom Datacenters.
6. Select the newly created Custom Datacenter. You should get the report about the VDI vCenters.