Here we go again with misleading information. I'm again doing this publicly because I spoke to THREE representatives privately. I've been reassured it is not possible. That said, I have no reason to not believe @EmilyLaney, but I do not see what she sees.

She mentioned that she started with these steps: Merchant Payment account > Processing Tools > Reverse a Trans > Search date > Select trans item checkbox

She then said to change Amount to partial refund amount. There is no option to change an amount on this screen. This is misleading to once again say that you can change something when nothing can be changed. See the attached screenshot. I did a screenshare with a QB support rep that experienced the same thing. 

So, publicly on this forum, how can I change an amount? It is not possible.