In combine payment method a maximum of two payment methods can be combined for a single transaction.
For Example, A transaction can be paid for with part cash and part credit card. This can be done only for the Box Office payments. Combine payments is set by default if you want to go and make any changes, follow the screenshots below:
1) On the Top left of your screen, there is a drop down with the Account name, click on the drop-down and go to the “Settings"
2) Click on the Transaction tab and under Miscellaneous Settings, you will be able to select the option 'Combine Payment Methods in Box Office'. Please check the box beside the option. You will be able to combine maximum two payment methods for a single transaction performed at Box Office.