The option to override payment amounts reported to a vendor for 1099 forms is unavailable in QuickBooks Online (QBO), jdillon.
The amount shown on the 1099 form are automatically calculated based on the payments you have recorded in QBO. This means that any adjustments to the amounts must be made at the source level by modifying the payment entries you've previously entered into the system.
Also, here are some articles that you can check for reference. These links provide complete information on about 1099 and how to prepare and file it in your QuickBooks Online (QBO) account:
If you have other questions about the 1099 in your QBO account, you can always tag me. I’m only a post away from you.