How do I store responses in individual tabs of the Google Spreadsheet?

Question 2.

I have three survey forms and I would like all the responses to be stored on ONE google sheet but have an individual tab for each form's responses.  Is this possible?

As far as I understand, you want to integrate an existing spreadsheet into your form. Unfortunately, the integration, that we provide, will always create a new sheet for the form.

I can suggest checking if you can use Zapier as a middleman for the integration: https://zapier.com/apps/jotform/integrations/google-sheets 

Hope this helps! But, please get back to us if you need further assistance.

Thanks.