Summary: 

To add multiple B2B admins to the portal

Steps:

You can invite additional Unleashed users as Administrators for the B2B Portal from within the Configuration tab by clicking on your B2B store's Configure button. 

Under the Administrators heading, all Unleashed users will be displayed in the Email drop-down list. Select the required user email from the Email drop-down list then click on the Invite button.

The user will receive an invitation to create a login and access the B2B Portal as an administrator. 

To manage your B2B Portal Administrators, log into your B2B store and go to Settings> Admin tab.