How to map custom Names field on lead to create as new contacts when lead is qualified

Question

I have created custom name, email, phone fields on lead apart from standard name email and phone fields. I want, when lead qualified and converted so it should be created as new contact under the same company name. How can I achieve this?

Please find below trigger:

trigger LeadConvert on Lead (after update) {

map<Id, Lead> mapNewLead = trigger.newMap;
List<Contact> lstContact = new List<Contact>();
for(Lead objLead: mapNewLead.values())
{
   if (objLead.isConverted == true) 
   {
     lstContact.add(new contact(LastName = objLead.First_Other_Contact_Name__c));
     lstContact.add(new contact(Phone = objLead.First_Other_Contact_Phone__c));
     lstContact.add(new contact(Email = objLead.First_Other_Contact_Email__c));
   }
}
insert lstContact;
}

Answer 1

When sales reps convert qualified leads, the information from the standard lead fields appears in standard fields for contact, account, and opportunity records. If you set up custom lead fields, you specify how that custom information converts to custom fields in accounts, contacts, and opportunities.

1. From the object management settings for leads, go to the fields section, then click Map Lead Fields.
2. For each custom lead field, choose a custom account, contact, or opportunity field into which you want the information inserted when you convert a lead.
3. Save your work.

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Updates

trigger LeadConvert on Lead (after update) { 

    map<Id, Lead> mapNewLead = trigger.newMap; 
    List<Contact> lstContact = new List<Contact>(); 
    for(Lead objLead: mapNewLead.values()) 
    { 
        if (objLead.isConverted == true && objLead.ConvertedAccountId != null) 
        { 
            lstContact.add(new contact(LastName = objLead.First_Other_Contact_Name__c,
                                        Phone = objLead.First_Other_Contact_Phone__c,
                                        Email = objLead.First_Other_Contact_Email__c, 
                                        AccountId = objLead.convertedAccountId));
        } 
    } 
    insert lstContact; 
}