In rare cases, you might want to set all of your inventory levels to zero, for example if you are completely changing your inventory. Setting inventory levels to zero does not adversely affect historical sales or inventory data, but will remove any active serial numbers from your inventory.
- Run a manual backup at Tools > Utilities > Backup Database.
- Go to Tools > Utilities > Troubleshooting.
- Click the Other tab > Zero All Inventory. This can take some time to complete, so it is best to run it at the end of a business day.