Making sure you're entering your bills correctly is a good way to avoid discrepancies in your books. I want to make sure I'm on the same page as you so I can provide the right info.
Based on your previous posts I see you were using the US version of QuickBooks, is that still the case? If not, I encourage to reference this helpful Canadian article which shares more info about IIF files. Here are some other helpful resources:
Yes, using the QBD US version. I am trying to enter the bills correctly, actually am and have no issues, but I'm unsure of where to place the Class in order for it to be uploaded via the file into that box in the screenshot. I'll review links. Thank you.