If I understand you correctly, you'd like to get PI Data into Northwest Analyst tool, right?
Based on the brochure available at NWA Quality Analyst | Northwest Analytics, the tool can get data using ODBC.
As such, you could use PI ODBC Client - Overview.
An enhanced version of PI ODBC is in the works (beta already available on request).
Based on some research, I believe NWA Quality Analyst’s database connectivity lets you define Quality Analyst Data Sets that use external databases as the source of data, where you can connect directly or via ODBC (can you confirm that?). If so, you can use the PI ODBC client. The PI ODBC Client can be used to bring process data into any ODBC-compliant client application.