How to create a new Category from the distribution list in an email received

I have a received new email with a distribution list.

I do not want to enter the contact information for each individual addressee one addressee at a time.

How can I create, in one step, a new Category and populate it with the distribution list of the email in my Inbox?

I think I have seen the answer to a similar question in the past but have not been able find it.

Thanks