Let deal with your concerns one at a time, lawrenceyantis.

Currently, we cannot print or send a vendor credits. You can take a screenshot of the vendor credit as a workaround. Or we can pull up a report about the vendor credit.

1. Click Reports on the left menu and search Transaction List by Vendor.
2. Click the Customize button and set the correct Report period.
3. Go to the Filter section and select Vendor Credit in the Transaction Type field.
4. Click Run report.

After customizing the report, you can already email it, print, or export to Excel.

Meanwhile, we cannot mix your vendor and customer transactions in one specific profile. We'd recommend creating a separate customer profile for your vendor: Add and manage customers in QuickBooks Online.

If you have customer balances that you want to use as payments for the vendor, we'll likely to create a journal entry. This is to adjust the balances of the Accounts Payables and Accounts Receivables accounts. With that said, I'd recommend reaching out to your accountant when it comes to debiting and crediting of the accounts. They know what's best for you and your books.

We'll be right here if you have additional questions regarding the process.