To move multiple users from one OU to another:

1. Open the Active Directory Users and Computers snap-in, from Administrative Tools.

2. Double-click the source OU to expand it.

2. In the right-hand pane, Right-click the first user to be moved.

3. CTRL+Click each user, or if they are in sequence, SHIFT+Click the last user.

4. Right-click the last selected user, from step 3, and press Move....

5. Select the destination OU and press OK.