commercebuild for WooCommerce is built for all types of ecommerce, including B2B. As such, WooCommerce users can switch between the customers linked to their account if they have the permissions to do so and customers linked to their account.
There are two shortcodes that can be used, one that will show the current customer code/number and another that adds the functionality to switch customers.
Current Customer Number
[cfw_current_customer_number]
This shortcode will display the first and last name of the user logged in, as well as the current customer number/code to which they are linked.
A/R Customer Switcher
[cfw_arcust_switching]
This short will display a link that allows a user to switch customers that are associated with their user. In some cases, this can be all customers in the ERP or a predefined list.
Upon clicking the Switch A/R Customer link, a popup will appear that will allow you to search all customer numbers/codes associated with your user and select the desired one from the list.