sort/merge and total matching key records using awk.

I have two (or more) files which have the same structure

i.e.
file1
01,ann,2,3,6,.......  
01,tim,9,8,7,.......
01,max,1,1,1,.....
etc

file2
01,ann,6,7,8,.........
01,tim,1,2,3,.......
01,jenny,2,2,2,....
etc

I want to merge these files into one but only have one record per person, with totalled values.

outfile
01,ann,8,10,14,.......
01,jenny,2,2,2,....
01,max,1,1,1,....
01,tim,10,10,10,.......
etc

There are over 2000 people on each flle and 70 variables to be totalled for each.
It is fairly straightforward to sort /merge the files and I can produce a an overall sum total of each column, but how do I just summarise multiple records for each person ?.

Needs to be achieved using awk.

Any help greatly appreciated.