You can create task against the opportunity from here as well. This is same as you create a task from activity manager window.
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The 'Task' field is mandatory to create a task. Click here to know more about 'Task Create/Edit window'.
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The 'Company', 'Opportunity' fields are auto-populated and you cannot modify these fields as you are creating a task against the same opportunity and for the same company.
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After adding the details, click Save button.
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The created task displays in the timeline view.
Click the task icon to see who created the task.