Step added for CSB

Author: AbhishekMallick01

includes/blob-backup-azure-portal-configure-backup.md

@@ -60,6 +60,8 @@ To configure backup for storage accounts, follow these steps:
         >[!Note]
         >The template contains details for selected storage accounts only. If there are multiple users that need to assign roles for different storage accounts, you can select and download different templates accordingly.
 
+   1. To configure the backup operation with a storage account in a different subscription (Cross Subscription Backup), choose the alternate subscription from the **Subscription** filter. The storage accounts from the selected subscription appear.
+
 6. To assign the required roles, select the storage accounts, and then select **Download role assignment template** to download the template. Once the role assignments are complete, select **Revalidate** to validate the permissions again, and then configure backup.
 
    :::image type="content" source="./media/blob-backup-azure-portal-configure-backup/vaulted-backup-role-assignment-success.png" alt-text="Screenshot shows that the role assignment is successful.":::
@@ -69,4 +71,4 @@ To configure backup for storage accounts, follow these steps:
 
 8. Review the details on the **Review + configure** tab and select **Next** to initiate the *configure backup* operation.
 
-You'll receive notifications about the status of protection configuration and its completion.
+You'll receive notifications about the status of protection configuration and its completion.