Hi there Charlie_17,

It's vital that all your transactions be entered correctly so that your books can be well balanced. QuickBooks Online is a great tool able to help you keep track of bills and expenses so that they can be viewed through various reports. I can provide some information about creating transactions. 

When creating transactions, if you click on a line item to add either a category or an item, the first click activates the drop-down menu to choose a product or an account, but in order to activate the text box to search that list, it does require a second click. I can see that you'd like the entire process to take one click. I recommend leaving feedback in the system by clicking on the Gear icon, then Feedback. The comments made in that section are taken into consideration by our developers when planning future updates to QuickBooks Online.

If you have any other questions, feel free to reach out here.