I think this report is already built for you on the assumption that you are charging and collecting taxes on your bills.  Go to the reports area and click on the taxes tab.  You should be able to run a "taxes on each invoice" listing.  Filter and sort the report as needed and make sure to check the options for the report as you want the box "merge in tax information" unchecked.

Thanks Allen, I will work with that, but I really need the Billing Attorney name in a column and in the same line with the invoice number and fees amount

With version 2011 I don't think there's much more you can do, except perhaps send the report to Excel. The newer versions of Timeslips offer some custom AR reports that offer additional formatting that might provide what you are looking for.

Out of the box the best you can do I think for the billing attorney is to sort on that field to get all the invoices together for that BA with a subtotal.  I took a look at custom invoice reporting and it appears that the tax paid fields for fees and costs are available as well as the billing attorney assuming you are using a custom field to support that.

That level of guidance is beyond this forum's capability, however, and I would encourage you to engage with one of the Timeslips consultants that supports this forum for guidance in this area.

Good Luck!