report to properly categorize billable items

[MBayDesign]

I posted into an older thread where some code I'm using is placed (see below) but it's a pretty old thread so thought I'd post my question as a new topic.

I use Billable Items to create invoices for clients for items generally related to website maintenance, but also to create recurring billing for apps or services, entire site design billing, graphic design, etc. 

I use actual products I've created under a hidden group name so the line items within the billable item invoice are assigned to real products, but the units and values are lumped together and reported in a single sum under MISC/Billable Items on the report shown in the thread below instead of filtering into the Products I created. It's impossible to break it down unless I go back through every invoice. 

Is there any way that billable item charges can be routed to actual products on a report so that it can be better classified - i.e. for tax purposes?