Add Sub-set Allows you to add a new sub-frameset to your current frameset. Think of it as creating a table within a table. Add Frame Allows you to add new frames to your frameset. Delete Deletes the selected item in the frames list. Edit Allows you to re-edit the selected item in the frames list. Move Down Moves the selected item in the frames list down by one. Move Up Moves the selected item in the frames list up by one. This is a list of the frames in this set. Select an item to use the Move Up, Move Down, Edit, and Delete buttons. Select the percentage of the frameset this frame will take up. Select whether to make this set of frames be vertical or horizontal rows.