I can share some information about integrating QuickBooks Online and Shopify, stannny123.
You can connect your Shopify account to your QuickBooks Online (QBO) account. You can set up the integration within minutes.
First, make sure to configure the integration settings according to your company's accounting procedures. For more information on how to set this up like how your sales, payouts, products, and stock level updates from Shopify will be sent to QBO, check out this article: Shopify and QuickBooks Online Integration Guide. That will also guide you sync with Shopify and QBO.
To verify if you can connect a single Shopify account to multiple QBO accounts, I suggest reaching out to Shopify's customer support.
Once you're done with the integration and you're encountering issues, refer to this article on how to resolve it: Troubleshoot Shopify issues.