In command line you need to use the folllwing syntax (on the example of advanced-hotspots analysis type):
>amplxe-cl -target-system=mic-host-launch -collect advanced-hotspots ./my_app_on_host
For GUI you need to choose the following analysis target:
and provide host application as application to launch.
You can also find more details in VTune help here.
Please note that in the VTune result you will have only collection from Xeon Phi target. We don't provide mixed host/card collection in one result.
Thanks & Regards, Dmitry