Hi shivani.
Just use CreateFromTemplateMessage. It's similar to CreateMessage, introducing 2 properties.
- Parent (optional) to specify the parent of the new Project/Milestone
- TemplateName the name of the template to use.
Check the documentation on:
https://api2.clarizen.com/V2.0/docs/html/T_clarizen_com_api_CreateFromTemplateMessage.htm
Hope this helps,
Ophir