Let see if I understand what you are trying to do :
Fiiler submits to the form Author
Author sends the data back to the Filler and ask the Filler to change some values
Filler change some values and submit back to the Author
If this is the workflow you are trying to achieve then this is not something that is currently supported by FormsCentral.
With a paid subscription you can send a Email Receipts with the data to the Filler (Options tab > Email Receipts) but there is no way for the Filler to change his data. He would need to send an email to the Author with the new data and the author would need to update the table manually.