Create a virtual appliance

To create a new virtual appliance to hold a group of VMs do these steps:

1. Go to Virtual datacenters
2. Select a virtual datacenter
3. At the bottom of the screen, click the + add button
4. If a menu displays, select "Create virtual appliance" and complete the form as described here
5. Click Save  

For more details see GUI Create virtual appliance

Now you can add VMs to the virtual appliance and deploy it.