Let's say that you want to create a new document that is published on June 1st in a specific release.
Then you want to display a special banner in this document afterward starting on June 4th to be part of a different release.
This is not a problem in prismic.io.
Create a new document version in a different release
Navigate to the document in the first release.
To add this document to a different release, click on the icon of three vertical dots that is next to the "Publish" button. Then select "Create a new version in another release..."
This will allow you to select another release or create a new one.
Once you've added the document to a different release, you will be able to make changes and modify it as needed for the second release.