public class CustomerViewModel
{
   // Various other properties removed for brevity

    public int DiscountRate { get; set; };

    public DateTime DiscountFromDate { get; set; }

    public DateTime DiscountToDate { get; set; };
 }

public class Customer
{
   // Other properties removed for brevity
   public IEnumerable<SettlementDiscount> SettlementDiscounts { get; set; }
}

public class SettlementDiscount
{
    public int CustomerId { get; set; }

    public int DiscountRate { get; set; }

    public DateTime FromDate { get; set; }

    public DateTime ToDate { get; set; }
}