Added billable users search on gitlab.com EE

doc/subscriptions/gitlab_com/index.md

@@ -112,6 +112,7 @@ to the **Billing** section of the relevant namespace:
   | **Seats owed**              | If your maximum seats used exceeds the seats in your subscription, you owe an additional fee for the users you've added.             |
   | **Subscription start date** | Date your subscription started. If this is for a Free plan, is the date you transitioned off your group's paid plan.                    |
   | **Subscription end date**   | Date your current subscription ends. Does not apply to Free plans.                                                                  |
+  | **Billable users list**   | List of users that belong to your group subscription. Does not apply to Free plans.                                                       |
 
 ## Renew your GitLab.com subscription
 
@@ -215,6 +216,10 @@ To upgrade your [GitLab tier](https://about.gitlab.com/pricing/):
 
 When the purchase has been processed, you receive confirmation of your new subscription tier.
 
+## See your billable users list
+
+To see a list of your billable users on your GitLab group page go to **Settings > Billing**. This page provides information about your subscription and occupied seats for your group which is the list of billable users for your particular group.
+
 ## Subscription expiry
 
 When your subscription or trial expires, GitLab does not delete your data, but