Navigate to the Object Manager
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To get started, login into Salesforce and navigate to setup.
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[https://login.salesforce.com/](https://login.salesforce.com/)
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Click the "Quick Find" field.
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Type "object manager"
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Click "Object Manager"
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Click the "Quick Find" field.
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Click the name of the object.
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Type the name of the object to which you want to add a field (e.g., "opportunity").
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Click "New"
Add the new field
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Click here:
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Choose the type of field you'd like to add.
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Click here:
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Click here:
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Type the label for the field.
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Choose a default value (if applicable).
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Click here:
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Click here:
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Add a description.