Head into the Products section
Click into the Inventory tab and click "import". There will be a linked template for you to utilize for your connivence.
If you are uploading your own export and not Parspec's recommended template, the map columns pop up will appear for you to match the columns with Parspec fields. Note: If a field is left blank, it will not populate into Inventory.
Click confirm import when done. Note: Imports overwrite existing data to allow for fast replacement