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1. 1. 1. 1. On the Discussions List page, click New → New Topic.
         2. Drop down Availability Dates & Conditions.
         3. Under Group and Section Restrictions, click Manage Restrictions.
         4. Choose the second option to Restrict topic and separate the threads.
         5. In the Group Category or Section dropdown, choose Sections.
         6. Click Add.

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This restriction can also be set by clicking Edit in an existing Topic's context menu ( button next to the Topic name) and following steps 2-6 above.

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