change type of item

Greetings, @Mfleener47 … and welcome to the forum! :)

It's not currently possible to change or move an item from one category to another because the fields are different in each category (they each have their own unique sets of default fields). Hopefully we can make this easier someday. For now, you would need to copy and paste the data into a new item in the new category.

You haven't mentioned which platform and version of 1Password you're using. If it's 1Password for Mac, this blog post has suggestions to make the process easier:

Quick Tip: Migrate your details between 1Password items

Hopefully that helps, and sorry I don't have a better answer for you at the moment. If you have more questions or need anything else, please let us know.