A split payment is where a customer wants to pay for the same sale via two or more payment methods. For example, they want to pay a sale amount via cash and card. 
To achieve this, you need to follow the below steps.

1. Enter the first payment amount in the amount tendered.
2. Select the first payment method.
3. Click OK, and the system will automatically show the outstanding amount.

Then you can select the second, third, or fourth payment method for the balance.