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Hey @Marketing!
Have you been able to create a resource to connect to your Google Sheets? https://docs.retool.com/docs/google-sheets-integration
And for WhatsApp, the template just opens a custom URL based on info from the Google Sheet.
I included the app's JSON if you're interested in checking it out 
You can import this JSON file by clicking Create new (home page) > From JSON!
Hello,
https://retool.com/templates/whatsapp-crm
Please refer to this Template.
When I click the Send WhatsApp button, it opens a page where I can send a message to a single contact.
How do I send it to multiple people at once?
With Regards,
Marketing Team
Using the open URL method in the template, you can only send a message to one person at once!
However, you can probably create a loop to trigger a single send query (using WhatsApp's REST API) for multiple numbers. Something like:
This loop uses Retool queries' trigger method with additionalScope passed in:
https://community.retool.com/t/how-to-use-additionalscope-in-your-queries/13343
And here's a post that walks through a query loop that also logs all the results together:
Let me know if that's helpful at all!