Choose Setup > System Configuration and click the Users tab. (If the Users tab is not visible, you must enter the master password.)
Select the Import button.
From the source drop-down list, choose the domain from which you want to import users.
Select the Select All button to select all available users for import, or highlight users individually and click the Select button.
After selecting users for import, mark the checkboxes in the Group list to which you want to assign the imported users.
Select OK to import the selected users.