I have a feeling that someone is taking the micky but it IS the weekend so I will sigh sadly and try to answer. Yuccas come from the tropics where they are weeds. In Costa Rica for instance they saw them down and use them as fence posts. Once in the ground they start to grow again and you have fence posts with yucca leaves. You could just cut it off at the height you want and it will grow again just below where you cut it, probably wither several shhots. It is normal for them to shed leaves from the bottom, that is how the trunk is formed. I had an outdoor Yucca which had grown to over 8' last year so I had mr apricot saw it down (yes saw, the trunk was over 6" in diameter) and I took all the babies off it and re-planted/sold them for charity. I was left with the bare trunk, no roots, no leaves, nothing. I stuck it in the ground and it now has at least 10 shoots (well 9 now as I posted one to darth vader) and is going strong. Good Luck but this is positively the last question I will EVER answer on yuccas.