If you want to manage your own inventory by uploading inventory into your wws_items table, then you need to turn on the advanced setting DONOTUPDATESTOCK. Use these steps to turn it on
1. Go to mainteditstore.wws - click 'edit'
2. Scroll to the 'advset' field and search for the tag 'DONOTUPDATESTOCK'; if not there, add this: TRUE
3. Save and you should be good to go. Keep in mind your items that have stock 99999 will continue to have 99999 until you upload a new file.