Create a look up[Lead] on product so that Products come over in related list of a Lead. Write script to create 3 Leads and 5 Products with Lead lookup field.

Step 1: Create Lookup Relationship Field on Product 

Step 2: Apex Script to Create Leads and Products 

// Apex script to create Leads and Products and associate them

List<Lead> leadsToInsert = new List<Lead>{

    new Lead(LastName='Doe', Company='Doe Inc.'),

    new Lead(LastName='Smith', Company='Smith LLC'),

    new Lead(LastName='Johnson', Company='Johnson Corp.')

};

insert leadsToInsert; // Inserting the Leads

// Assuming the Leads are inserted and we have their IDs, create Products and associate them

List<Product2> productsToInsert = new List<Product2>{

    new Product2(Name='Product A', Related_Lead__c=leadsToInsert[0].Id),

    new Product2(Name='Product B', Related_Lead__c=leadsToInsert[0].Id),

    new Product2(Name='Product C', Related_Lead__c=leadsToInsert[1].Id),

    new Product2(Name='Product D', Related_Lead__c=leadsToInsert[1].Id),

    new Product2(Name='Product E', Related_Lead__c=leadsToInsert[2].Id)

};

insert productsToInsert; // Inserting the Products