How to write multiple nested objects in a C# model to a sql database

I have the following model object in c# that I'm receiving in a WEB API from a POST - Does anyone know how I would write this object to a database? The tables can be whatever, I'm just not sure how to cycle through this model to get the 'Sequence', 'Quote' & 'Items' to flat files from objects.

[Serializable] public class PickupDetail { public string driver_name; public class PickupDate
{ public DateTime pickup_date; public class Sequence { public int sequence_id; public int location_id; public string company; public string address; public string city; public string state; public string zip;

            public class Quote
            {   public int quote_id;
                public bool complete;
                public string customer;
                public string destination_customer;
                public string purchase_order;

                public class Item
                {   public int quote_pickup_id;  
                    public int return_id;        

                    // Quote Detail
                    public int quote_detail_id;
                    public string description;
                    public bool selected;
                    public bool show_note;
                    public int pickup_qty;
                    public int qty_received;      
                    public int labels_printed;    
                    public string comments;       
                    public int return_qty;
                    public int qty_returned;      
                    public string return_comments;
                    public DateTime date_time;
                    public string driver_name;
                    public class OriginalItem
                    {
                        public int qty_received;
                        public int labels_printed;
                        public string comments;
                        public int qty_returned;
                        public string return_comments;
                    }
                    public OriginalItem original;
                }
                public List<Item> items;
            }
            public List<Quote> quotes;
        }
        public List<Sequence> sequence;
    }
    public List<PickupDate> dates;
}