Employee Service Items

Hello,

We are a small consulting company and I am trying to get some ideas on best practice for employee service items.  Right now each employee has their own Service for Sale item that they select when entering their time (Service Item = Employee Name).

We have always billed time to show individually on invoices (Employee A 5 hrs, Employee B 7 hrs etc.), however we now want to switch to grouping all time on an invoice into one line item. 

I have made the change in the Accounting and Time/Billables Setup to do this however I noticed that instead of one line item on the Billable Time tab now there seems to be a line item for each Service Item group.  My first thought is that to be able to group all employee time into one line item we need to change the way the Service Item is set up....any thoughts?