Below is an example of how to export catalog data from WebSphere Commerce. You will need to change STOREID to the store id that holds the catalog data. You will need to change CATALOGID to the catalog ID you want to export. If you have sales catalogs you will need to provide those as well.
Use the following command to extract the data:
massextract.cmd -dbname [DATABASE] -dbuser [DB2USER] -dbpwd [PASSWORD] -filter extract_catalog_filter.xml -outfile catalog.xml