Add Custom Activity Field to Task Page Layout In Salesforce Classic
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In Salesforce, click Setup.
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Type “Task” in the Quick Find box.
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Click Task Page Layouts.
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Click Edit next to the task page layout you’d like to add this field to.
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Drag and drop the field to the desired section of the Task page layout.
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Click Save.
Salesforce Lightning
Create Custom Activity Field in Salesforce Lightning
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In Salesforce, click on the gear icon on the top right and select Setup.
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Click Object Manager.
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Type “Activity” in the Quick Find box.
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Click the Activity label.
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Click Fields & Relationships.
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Click New.