If you want to create an overall statistics file from your daily generated WebOffice 10 R3 statistic files (WebOffice_<DATE>.csv), you can create a batch file for this.
Create an empty batch-file (e.g. overall_stats.bat) in your WebOffice work-directory (e.g. C:\Tomcat\webapps\WebOffice\WEB-INF\work). Enter the following lines assumed your work directory is located C:\Tomcat\webapps\WebOffice\WEB-INF\work and your statistics file should be named overall_stats.csv:
del /F /Q C:\Tomcat\webapps\WebOffice\WEB-INF\work\overall_stats.csv
copy "C:\Tomcat\webapps\WebOffice\WEB-INF\work\*.csv" "C:\Tomcat\webapps\WebOffice\WEB-INF\work\overall_stats.csv"
Once the batch file has been executed, the resulting csv-file contains all calculated statistics located in your work folder.