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Hi there,
Thank you for your suggestion!
Great news! This feature is already supported by WooCommerce Subscriptions (as of version 8.7.1). You can set up quarterly billing by setting the billing interval to “every 3rd month” when creating a subscription product. You can find more details in our documentation: https://woocommerce.com/document/subscriptions/creating-subscription-products/
Therefore, I am marking this request as completed.