If you accidentally delete a frameset, you can import it back into the project if it has not been removed from the hard disk.
1)Select Project > Open > Pods > Project Manager.
2)Expand the HTML Files (Topics) folder.
3)Select the frameset file to remove.
4)Click the Delete button .
tip: Deleting a frameset in the TOC, or one that is referenced by a hypertext link, moves the frameset to the Broken Links folder. To add it back into the project, right-click and select Restore.