Hello Bairdc, In QuickBooks Online when you add or match a transaction in the banking section it will change it to a cleared transaction in the chart of accounts register for the bank account.
You can use the reconcile tool in the cog in the top right of QuickBooks which then shows all cleared transactions if you wish to do a full reconcile. For the 1st reconcile it will ask you to enter an opening balance and date and ending balance for that period (say if you are doing one month) More information on the reconcile tool itself can be found here
Any questions let us know we'd be happy to help further.
