BSI TUBS (Please very urgent)

Hi SAP Experts

our client in North America applies BSI Tubs every quarter,generally they get TUBS (Tax upadated bulletins) from BSI website by loggin in it and these TUBS are given to the tax specialist of our clientside to review the TUBS to check whether they are applicable to our client,she reviews it and gives feedback to the implementation company to apply them( i mean which ever TUBS are applicable to our client),once applied by the technical team ,as a payroll production support and knowledge transfer consultant ,i have to sit with the tax specialist and test these TUBS to check whether they are working properly or not ,but i never did TUBS testing before ,please can any body help me in detail or give me some documentation ,please its very urgent .

eagerly waiting for your reply

regards

Sangitha reddy