You can import an existing specification using the Customization Specification Manager, and use the specification to customize the guest operating system of a virtual machine.
Before you begin, you must have at least one customization specification saved as an xml file located on a file system accessible from the vSphere Web Client.
- In the vSphere Web Client inventory, select and click VM Customization Specifications.
- Click the Import specification from a file icon.
- From the Open dialog, browse to the .xml to import and click Open.
The imported specification is added to the list of customization specifications.