Has anyone had luck adding new Variants for existing Products? Support also could not figure out how, so they opened a case, but it was later closed with no resolution

I appreciate your efforts in trying to add these Variants and reaching out for support, Jamie.

Currently, the option to manually add new variants directly to a product in QuickBooks is either under development or planned for a future release. You're on the right track by utilizing the bulk import option to add product variants.

To add a new variant to an existing product, ensure that you enter the correct name and description, fill out the necessary fields, and tick the box beside Check this box to overwrite details of existing items with the same name and category when bulk importing.

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To get helpful insights on the things you buy and sell, and the status of your products, visit this article for guidance: Use reports to see your sales and inventory status.

You can always revisit this thread for any follow-up questions regarding managing your products and services in QuickBooks. My team and I are ready to support you.