Setting the value of an additional field when ticket is created based on category/subcategory

Setting the value of an additional field when ticket is created based on category/subcategory

I can't seem to figure out how I set the value of an additional field when a ticket is created based on the category/sub-category. We are using this for both the operations and development side of it. We have an additional field that is used to track if a ticket is an operations or development ticket. I'd like to be able to set that automatically with some of our category/sub-category combinations.

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