Before you can add support for commerce data, you must have the following installed on your Sitecore server:
In xDB Data Migration Tool, a tenant is the basic unit of organization. All of the settings that describe the data migration process are defined here.
Adding support for commerce data involves adding new mappings to an existing tenant. This means you need a tenant in the first place.
This component provides the ability to add mappings to existing xDB Data Migration Tool tenants. You must install this component on your Sitecore server.
This component is installed through a Sitecore installation package. You can download this component from the Sitecore Developer Portal.