Need to default worktype based on the AP invoice amount

Summary:

We have a requirement from client when we import AP invoices to projects for which line amount is less than 0.03 USD we need to make the cost line non billable.

Is there a way we can derive the work type by customizing in project cost collection flex field?

Content (required):

Client doesn't want to bill cost lines whose amount is less than 0.03 USD

Version (include the version you are using, if applicable): 22C

Code Snippet (add any code snippets that support your topic, if applicable):