To manually split a fee, we will go to:

Finance->Sales and listings -> Receipts

We will search in the list of tickets the fee we want to split in severalpayments, and click on the "Edit" button.

Once inside the ticket tab, we click on the "View Receipts" button at the bottom of the screen.

We will open a window, with the receipt, in this case a receipt of 50 euros. 

In case we want to split it into two payments, we must first delete the original receipt, by pressing on the "X".

Once we have deleted the original receipt, we click on the "New" button as shown in the image below.

In the tab of the receipt, we will choose the date of issue and expiration, the form of payment, and the amount. 

If we want to divide a fee of 50 euros in two equal payments, we will enter the amount of 25 euros and we will click on update and repeat the process one more time.