How can I send emails to suppliers at one email for their sales department and another email for accounts when i send a payment remittance without changing it manually?

Hello, Tony.

This is very easy to do in QuickBooks Online. I have the step-by-step instructions on sending a remittance to multiple email addresses. 

You can add the second email address in the supplier's profile. This will let you send a single payment remittance to multiple email addresses. 

Here's a step-by-step guide: 

1. Go to Expenses, then head over to the Suppliers tab. 
2. Select and open the supplier's profile.
3. Click the Edit button.
4. In the Email text box, add the second email address (separated by a comma). 
5. Once done, click Save. 

Next, open a bill payment transaction to send the remittance advice. 

1. In the supplier's transaction list overview, select a bill payment transaction.
2. Review the transaction before sending, then hit Save and send.
3. In the email review screen, click Save and send again. 

There will be a note that the remittance is successfully sent to the email addresses. Just open the bill payment transaction again, then look at the Last delivery note. 

Also, you can do this to other forms or reports. Check out the full guide here: Email a sales form or report to multiple email addresses.

If you need help managing other supplier transactions or simply with other things in QuickBooks Online, check out our articles. Look for a specific topic then browse for an article here. 

Page me in this thread by tagging my username (@jamespaul) if you have future concerns with QBO. I'm more than happy to provide guides and assistance. A jolly good day to you!