This article will show you how to amend the open float of a cash drawer/till for a specific day.
Go to Manager > Sales, then click on the Till Floats/Register Bank tab.
Single-click on the float you wish to change so that it is highlighted, then click the Edit Open Float/Edit Open Bank button.
Enter the new float amount in the Update Float pop-up, then click OK to finish.
This will update the Open Float for the day you are editing and subsequently the Close Float for the previous day.