vertical lines in standard script

Hi Folks,

iam copying standard script into z-script and addig some more fields to standard script.for line-items i want to draw vertical lines.for this i can draw using box command.but my question is for one purchase order only 3 line items and for some purchase order there may be 5 line items.it may b different for different purchase orders.how can i maintain vertical lines according to the line items.i dnt want to maintain extra space.

Thanks in advance,

Neelima.N