Can i use my one account extended licence plugin in my other partner account WordPress theme?
Extended licenses don’t give you permission to use plugins on files for sale here. You have to have permissions and agreements from the author.
Even with this I would expect them to want the license associated with the author account of the theme, you’d definitely need one license (developer or with agreement to use) per theme it’s used in irrelevant if the account, but you’d have to ask them.
No, you need to either remove the item from the first file or purchase another copy of the extended license to use it on other project