Please follow below instruction to use Split Payment method.
I. Create Split Payment Transaction
Step 1. Select Product to sell - then click Pay
Step 2. Enter you amount
If you enter the amount tendered under the amount to pay, the second payment should be appeared. Then you can choose payment method for the second payment and enter the amount.
Note: the 3rd payment will appear if the 2nd payment is not enough.
How to Split Payment