Yes, Stu was right on with the Drag and Drop and Copy/Paste to move the stanza's within the cue. If you need to add a new Stanza, at this time, it must be done from within the Insert Lyric window. We do have a plan to add an easier way to add Stanza's from within the Script so you don't have to go back into the Insert Lyric window. We hope to have that added soon.
Currently, there is the option to add a new Page and then add a Text Box to type or paste in the text to create a make-shift Stanza if needed on-the-fly.
I hope this helps!