You want to know how Avalara Item Classification works AvaTax.
Avalara Item Classification
Avalara Item Classification is a tool that receives a list of items and descriptions from the customer via API or FTP and then returns Harmonized System (HS) codes mapped to each item on the list. HS Codes are globally accepted for items based on their detailed descriptions. The content affects transactions once the items have been mapped and included on an invoice with a tax engine that supports HS Codes. You can import your items with HS Codes into AvaTax after they have been mapped. Mapping occurs through "Item Master" within AvaTax, if you are using Avalara Item Classification with storage. You can also map HS codes to Items in AvaTax by following the steps to Map the items you sell to Avalara tax codes.
Avalara Item Classification and AvaTax only interact through Item Master when you have purchased Avalara Item Classification with storage, at this time.
Avalara Item Classification does not have a user interface and does not do any form of tax calculation, and does not file returns.