GA Sections in a reserved facility

Hi everyone:

I've scoured the forums and found a few posts on combining GA and Reserved sections in one facility that date back about four years. We would like to offer for example the first four rows of a facility as reserved and the remainder as GA.  

Has anyone accomplished this with any success? Is this possible on TNEW? For example, the Reserved sections have row and seat numbers and the GA sections are labeled GA without seat numbers?  

Would love to hear from anyone who's had experience with this.

Thanks!!