Perform the following steps in Deployment Manager:
- Make a new collection
- Add | LDAP Query
- Click 'New Query'
- Leave Find field as 'Computers' and by 'In: Entire Directory' click 'Browse'
- Expand and select the OU in question and click 'OK'
- Click Next
- Add the logs that are required and click 'Next'
- Click Finish
- View the collection and will display the computers from that particular OU.
Note: The advanced tab can be used to further filter results based on computer name, OS version, etc.