You can create a permission group and add any users from the Site to a group. You can then grant permission to folders by groups rather than granting permissions to each individual user.
To create a permission group
In the Administrator, connect to the server, then click the Server tab.
Do one of the following:
On the main menu, click Configuration, then click Create New Group.
In the left pane, click Groups.
In the right pane, click New. The Create New Group dialog box appears.
In the Site box, click the down arrow to select the Site for which you want to create the new Group.
Type a name for the Group in the Group Name box. For example, type Password Admins.
Click OK. The new group appears under the specified Site in the Groups node.