I have one query regarding SSID configuration using template.

[Bdas]

Can I create a SSID for multiple networks using template?

If so, what are the things I need to be careful about? Like if I map the networks to the new template, will the networks lose any existing configuration?

[alemabrahao]

Yes, you can.

https://documentation.meraki.com/Platform_Management/Dashboard_Administration/Design_and_Configure/O...

Note: When binding an existing network to a template, its current configuration will be lost and it will begin using the template configuration.

[Bdas]

So that means entire existing configuration will get removed.

[alemabrahao]

yep

[pdeleuw]

Yes, existing config will be removed. If you unbind the network from the template, you have the choice: Restore the (pre-template) configuration or keep the template config.