May I suggest you check out Commercient's integration app. They have implemented over 85 integrations between multiple ERP & CRM's Including Quickbooks Online. Their integrations are highly customizable and can be as in-depth or as simple as needed. The app is also available on SugarExchange.
Thanks!
You could try importing Excel data into SugarCRM as quotes and syncing to QuickBooks. Tools like Skyvia are one option to simplify this process without coding, or you could explore other integration tools that handle these workflows efficiently.