Thanks. I didn't know about the token limit, that explains the empty file. I have imported the files into Access and created a query with only the data from the 60th column. I could then export the queries into separate csv files and then do something like the script above.. but was hoping to skip that process and do it directly from a batch script....
By "add" I meant not an mathematical function but to add data to column 4 in FileB.
Currently File B looks like:
After result would like file B to be:
RowHeader1,0,1, Column 60 Row 1 data from FileA
RowHeader2,0,1, Column 60 Row 2 data from FileA
RowHeader3,0,1, Column 60 Row 3 data from FileA
Works well, not exactly what I was looking for but my fault for not being clear. This looks handy to use in future as I have another project where I would need to do a multiplication function on 2 columns of a csv file and create a new file that copies the resulting values for each record.