Hello there, @brett-imprints-k. Yes, you can connect/sync two different eCommerce platforms to your (one) QuickBooks Online (QBO) account. I'll gladly share further details about this.

QuickBooks incorporates hundreds of popular business apps. Both the BigCommerce and WooCommerce platforms are supported and can integrate with QBO. To sync them simultaneously, you need to subscribe and use QuickBooks Commerce. It seamlessly works with QBO to connect multiple sales channels and offer the most comprehensive accounting tools for your eCommerce businesses.

You can sign up for QuickBooks Commerce through this page: Power your e-commerce business with QuickBooks Commerce, your platform for selling smarter.

Also, you may want to check out this article as your reference in case you need to learn more about accessing and setting up QuickBooks Commerce from within QBO: Get Started with QuickBooks Commerce.

Please keep me posted if there's anything else you need or questions about integrating QuickBooks Commerce in QBO. I'm always ready to help. Take care, and I wish you continued success, @brett-imprints-k.