To add an Alias role:
Right-click the Roles folder in the Navigator pane and click New... in the shortcut menu.
On the General tab, type the name of the new role in the Name box and type a description (optional) in the Description box.
Note: The role name must be unique from all other role names.
Click the Members tab, which is blank because no members have yet been added to the role. Right-click in the members table and click Add in the shortcut menu. Click the names of the needed members in the Members dialog, and then click OK to return to the Members tab.
The members you selected now appear on the Members tab.
Click the Rule tab.
By default, Alias is selected, as it is first in the list available rules. Assign a member to the alias role by selecting the Enabled option next to the member’s name.
Click the Security tab to configure permissions for this role. For more information, see Security Tab.
Click OK to save the role and close the Role editor.