You can use the following variables in the Calculated Fields section of the Data Settings to export the B2B company name and external ID associated with the Shopify customer record:

• {{ company_contact_profiles.company.name }}
• {{ company_contact_profiles.company.external_id }}

To export the data which determines whether the customer is the company's main contact, you can use this variable below (will export True or False):

• {{ company_contact_profiles.is_main_contact }}

On the "Templates" page of EZ Exporter, there's aslo a template you can use called "Shopify B2B Customers" which already includes these fields and already has a filter configured to only export customer records that are linked to a B2B company.