Job information on time billing invoices

I am trying out MYOB as a possible transition from our current accounting package. I am generally very happy with the functionality and have managed to set up most things. My issue is time billing invoices.

We have customers who have several different jobs, and we assign them a unique job number and detailed description. I can enter these jobs with no problem and link them to each customer. I can extract the time information by job number on each invoice.

What I can't do is get the job details to show on the time billing invoice. I need to have the "Invoice to" section populated by the customer information (done, easy) and also display the job number and details in another spot. I can copy these across as a comment field, but there must be a way to link and display this information automatically.  I have spoken with my MYOB adviser, and her only recommendation is to use the comments field manually. 

I am open to suggestions on how to set it up. It may be that "jobs" need to be created as sub-level clients? (except I can't see how to do this either). Any ideas? 

(I also can't create time billing invoices in the web browser version, which seems a bit limiting.)