A QuickBooks invoice can be created from the CRM.
Required settings:
- QuickBooks Integration is Enabled
- QuickBooks is Connected
- QuickBooks product ID must be set on the corresponding CRM product record
- QuickBooks Account or Customer ID must be set on the corresponding CRM Account or Customer
How to Create a New Invoice
1. From the Object Navbar, click on the Opportunity module.
2. Open an Opportunity record and click Tools > Create Invoice . 
Won Opportunity
Invoice creation is only available for opportunities that are already "Won"
3. Message briefly appears "Invoice is Created".
4. Scroll down to QuickBooks Info section.
5. Notice that the QuickBooks Invoice ID field is set.
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