Note the issue with your raw data, "src-xlated ip" and "dst-xlated ip" are being extracted as "ip" because of the space. I used rex to pull them together. It would be better to change the log format. The next step would be to take this regex and add it to an extract and transform.
assuming sent/received is in bytes, here is a good start for you:
NetScreen | rex field=_raw "src-xlated ip=(?<src_ip>[\d+\.]+)" | rename src_ip AS "Source IP" | stats sum(sent) AS sentBytes sum(rcvd) AS rcvdBytes sum(eval(sent+rcvd)) AS total by "Source IP"