Complete the following steps to add and existing activity to a topic:
1. In your course, click Content.
2. Select the unit you want to add the activity to.
3. Click Add Existing.
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4. Select the activity e.g. Discussion
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The Insert a Discussion window appears.
5. Select the location for the Activity.
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6. Select the Activity (which discussion topic you want to link to)
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Optional: Click the Visibility toggle to make the activity available to learners.
Result
The existing activity has been added to the topic.