Merge, sort and subsort data files

Hi, I'm looking for a freelancer who can help me merge, sort, and subsort a set of data files. Specifically, I've got two Excel files that need to be merged, sorted and subsorted according to my criteria. I will provide the files, so it will simply be a matter of organizing them according to my instructions. No external sources need to be sourced. In order to do this job correctly, the freelancer will need an in-depth understanding of sorting, subsorting and manipulation of data files. Time is of the essence, so I'm looking for someone who is willing to work quickly and efficiently. Detailed information is below.