Mahmoud, 

I must have misunderstood.  I thought you needed it to show on your balance sheet as well.   I believe the process that I detailed in my previous post will work for non-balance sheet accounts as well.  Instead of pointing your Item to a Fixed Asset account, point it to the account that you need to track.  Still use the items when you enter an invoice and select the job that the charges pertain to and it should still show up on the job reports.  

Let me know if it works!  :-)

Brenda