If I create and submit a sitemap index, does that mean I don't have to submit each individual sitemap to Google as well?

Correct. The sitemap index tells them about the other sitemaps.

If I create and submit a sitemap index, does that mean I don't have to submit each individual sitemap to Google as well?

Yes, but i don't think the google sitemap is working now :eek: as i don't see enough results out of it :sad:

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