This option is only available if you have both VM and PC/SCA enabled for your subscription.
You can quickly add hosts (IP addresses) that are already part of one app to another app in your subscription.
From your app, go to Assets > Host Assets, select one or more IPs/ranges in the list and choose "Add to Another App" from the Actions menu. In the Add Hosts to Apps window choose the app you want to move the selected IPs.
This option is only available if you have both PC and SCA enabled for your subscription. You can choose to move IPs from PC app to SCA app or vice versa.
From your app, go to Assets > Host Assets, select one or more IPs/ranges in the list and choose "Move IPs" from the Actions menu. In the Move Hosts to Apps window choose the app you want to move the selected IPs.