You would need to use the API.  Their are a number of pre-written automaton scripts - you might be able to find one close to what you want and then modify from there. https://github.com/meraki/automation-scripts   You can find the Dashboard API documentation here. https://developer.cisco.com/meraki/api-v1/   ... View more

Whenever you have to automate across multiple networks or templates in your case the sole answer will always be.  Use the dashboard API.  You can start here and try to find the correct resources to call: https://developer.cisco.com/meraki/api-v1/introduction/ But I do have to question why you have 30 templates.  Since you do have local overrides per network, could a refactoring of your templates be in order? ... View more