Per-VDOM administrator accounts only allow administrative access to specific VDOMs. By creating per-VDOM administrators, you allow both Company A and Company B to manage their respective VDOMs without allowing access to settings for other VDOMs or the global settings.
To create a per-VDOM administrator for VDOM-A, go to System > Administrators and select Create New > Administrator.
Enter a Username and set Type to Local User. Enter and confirm a Password. Set Administrator Profile to prof_admin.
You must use either the prof_admin or a custom profile for per-VDOM administrators.
Remove the root VDOM from the Virtual Domains list and add VDOM-A.
Repeat the above steps to create a per-VDOM administrator for VDOM-B.