How can I send an invoices to multiple contacts of 1 company? While editing the company info, I can just fill in 1 mail address.

Hello there, @carolin-schmidt.

I can guide you on hoe to achieve this goal.

You can enter multiple emails on the invoices or your customer's profile. Any attached email will receive the invoice once sent. Make sure that the email addresses are separated with commas (,).

Please check out the sample snips attached below on how add them on your customers profile and on sales forms:

To give you more tips about emailing and forms and customizing sales forms in QuickBooks Online, please see these resources:

• Email a sales form or report to multiple email addresses
• Customize invoices, estimates, and sales receipts in QuickBooks Online

Know that my doors are always open to help if there's anything else you need. Thanks for coming, and have a good one!