How to delete one product:

• Navigate to the Inventory page.
• Search for the product which you’d like to delete.
• Click on the ellipses on the right hand side
• Then click “Remove”.

How to delete multiple products:

• Navigate to the Inventory page.
• Click on the checkbox near each product which you’d like to delete.
• Click “Actions”.
• Then click “Delete”.

How to delete a mass number of products:

If you have a large number of inactive products which you’d like to have deleted, you may reach out to support to have them deleted from the backend.

See here for more info: https://faq.inventoryahead.com/can-i-delete-multiple-skus/