Making long ponytails is simply shifting the existing balls down, and making all the balls the same size.
Click HERE to read my explanation of how the [Add Ball] section is set up, and then the following information will make more sense.
After getting an idea of the Add Ball section, making long ponytails should be easier to understand.
 
Now type in the babyz rez lnz for the type of baby you want to hex.  Note that the lnz is LNZ in lowercase.
 
White Girl =  Wg.lnz
Black Girl = Bg.lnz
Tan Girl = Brg.lnz
Asian Girl = Ag.lnz
 
When you've found the lnz section for the baby you want, scroll down to the Orange side ponytails section.  To the right is the code I use to replace the original 2 ponies code.  Simply type over the original ballz, and use the space bar to space over the last ball that you will not need.  This should give you the longer ponytails.  If something does not look right, you can use your new knowledge of the Add Ball section to shift the balls into place.  Be careful when editing, because the babyrez can be a bit tempermental at times.  If something goes wrong, you can always start over with your backup copy of the babyrez.dll