sourceInstanceTemplate property

Specifies the instance template from which to create instances.

You may combine sourceInstanceTemplate with instanceProperties to override specific values from an existing instance template. Bulk API follows the semantics of JSON Merge Patch described by RFC 7396. It can be a full or partial URL. For example, the following are all valid URLs to an instance template: - https://www.googleapis.com/compute/v1/projects/project /global/instanceTemplates/instanceTemplate - projects/project/global/instanceTemplates/instanceTemplate - global/instanceTemplates/instanceTemplate This field is optional.