Whenever you cut or delete text frames, no text is deleted; the text remains in the thread.
You can cut a frame from a thread and paste the frame elsewhere. The frame is removed with a copy of the text, but no text is removed from the original story. When you cut and paste a series of threaded text frames at once, the pasted frames maintain their connection to each other, but lose connection to any other frames in the original story.
When you delete a text frame that is part of a thread, no text is deleted: it is overset or it flows into the next frame in succession. If the text frame isn’t connected to any other frame, the frame and text are deleted.
Using a selection tool, click the frame.
Using the Type tool, hold down Ctrl (Windows) or Command (Mac OS), and then click the frame.