The expected bonus from the slaughterhouse can be registered as an income per kg slaughtered weight og then be a part of the economic calculation on your production report.
In the menu "General entries", "fixed prices" and "Income" you enter the location(s) from where you deliver slaughter pigs. When choosing "Price per" you have to choose "3 Kg approved slaughtered" in the dropdown menu:
The "Income type" can be chosen by clicking "F5" when you are in the "Code"-column and all the possibilities will be shown. Here you double-click on code 22 "Slaughterhouse add. payments".
In "Variant" you define the price of the given period, the price is not constant. Double-click on this entry column og you can set the price and the date, from where the price should be valid.