Use a setting on the Administrator Desktop to allow the grouping. Please follow the below steps:
Open the Administrator Desktop.
Select Accounts Configuration.
Select Bank Reconciliation.
Tick the box on Office and Client for Date/Ref Group.
Select Apply and OK.
Once this is done follow the below steps to group in the Bank Reconciliation.
Open the Accounts Desktop.
Go to the Bank tab.
Pick the Bank Reconciliation.
Select the Bank required and the Sheet No.
Select OK.
Go to Tools at the top of the screen and select Group Items in the dropdown list.