You can't use the "Postman Lite" on the Meraki API Documentation for configuring multiple ports at a time. The "postman lite" on meraki.io only serves as a demo/quick test of the API Endpoint. If you need to configure multiple ports at a time, you either need to look into scripting using e.g. Python, or install Postman locally on your machine. I'm told you can make loops in Postman, so you can configure more than one port at a time, but I have no experience with Postman, so you'll most likely be on your own, or ask somebody else for help.
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