When you create a bill and save it, whatever you have put as the category so for example if the category was fees, if you go to the chart of accounts and in the search bar type fees and run the report you will see that bill you have created for the customer in there.
Although it appears as you say under the category, if I look in the creditors account history and open their account A/P history. The transaction (Bill) is not on their record. I have recently converted from Quickbooks Desktop (over 10 years usage) to Quickbooks Online and this is a problem that I reported before. With the original incident one of your colleagues took control of my computer and solved the issue, when I questioned how to solve the problem, I was informed that the page need to be refreshed. Which obviously I have tried this time to no avail, so therefore I am need of some more help with this problem.