Steps to complete:
- Go to Settings.
- Go to Customizations.
- Click Customization the System.
- Click Entities and expand the Lead entity.
- Click on 1:N Relationships.
- If you want to map from Lead to Opportunity, look for opportunity_originating_lead (pictured). If you want to change Account or Contact, look for account_originating_lead and contact_originating_lead, respectively.
- Find the Mappings section in the top left hand corner of the window that pops up and click Mappings.
- The following screen pops up.
- Choose the field from the Source (Lead) and map it to a field in the Target (in this case Entity).
- Click OK.
- Repeat for other fields

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