At times it is not possible to take the entire story in Sprint, in such situations avail Split Story, and take a portion of the current sprint.
The only Permitted user can split story.
on click of the split will open a new page.
In this page, you can change the story details like story title, Priority, source, owner etc..
The user can move a task to split story or after a move, you can remove from the story.
The user can move connected issues to a new story and also remove from the split story.