Severing is a type of IRecipeManager and implements all the methods that are available to IRecipeManager's, such as removeRecipe() and removeAll().

The following script adds a Severing recipe that drops a Diamond when a Sheep (Entity) is killed.

ZenScript
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// <recipetype:tconstruct:severing>.addRecipe(name as string, ingredient as CTEntityIngredient, output as IItemStack)

<recipetype:tconstruct:severing>.addRecipe("beaheading_test", <entitytype:minecraft:sheep>, <item:minecraft:diamond>);

The following script does the following:

1. Removes all Severing recipes that drop a Skeleton Skull.
2. Removes all Severing recipes that drop from a Creeper (Entity).

ZenScript
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// <recipetype:tconstruct:severing>.removeRecipe(output as IItemStack)
// <recipetype:tconstruct:severing>.removeRecipe(input as CTEntityIngredient)

<recipetype:tconstruct:severing>.removeRecipe(<item:minecraft:skeleton_skull>);
<recipetype:tconstruct:severing>.removeRecipe(<entitytype:minecraft:creeper>);