Printing Split Checks Evenly prior to payment

We are unable to print, evenly split checks, BEFORE being paid. It is only possible to print when splitting a check manually, and dividing each separate item on the check. This is very very time consuming.

An example of a guest interaction. 4 people say .. "Can you split this check evenly". So we can not do it and print. We can only present the check as it is and pick up 4 credit cards or cash.
If we have them on their own seat it is ok and we can print. The problem again is with an even split. Thats in half, thirds whatever. Our old system from 1932 was able to do this. Please please help