Guidance creating conditions

Hi. I’m here with a problem. I’ve created a form where I have several parameters but I’d like to create the following example:
I have a template field and I have another field for article and in this case imagine, if the customer writes 9000 in the template field, I want the article field to be automatically filled as a suit. This is possible to do?
I am having some difficulty here in the search for a solution on the internet.