more (than 1 or 2) song text lines

Hello,
In a song that i'm eleborating, I 've got a Verse which 6 similar music lines - but every time with another tekst line. To add a song tekst, I select a note, then use Ctr L. This works perfectly well for the first line of words. Then, with some adjustments to the same procedure, I can write a second song line under it. Then, with some more adjustments to the same, I can add a 3rd songline.
But adding songlines 4, 5 and 6 (under the same melody) does not seem to be possible.
Can anybody help please?
Thanks!