Hello dear, @jhcct.
When spending money, the amount in your bank account will decrease, and the expense will increase. The expense will decrease when a deposit in your bank affecting on the same expense account.
Additionally, you can check this article to learn about tracking bills and recording payments: Enter bills and record bill payments in QuickBooks Online.
I'll be around to help whenever you have other questions about the expense in QuickBooks. Keep me in the loop by leaving the details in your reply. Have a good one.
