Create and edit records in single view in MVC

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ASP.NET

MVC

I have two class as below:

public class Agency_Master
    {
        [Key]
        public int Agency_Id { get; set; }

        [Display(Name = "Agency Name")]
        [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide Agency Name")]
        public string Agency_Name { get; set; }

        [Display(Name = "Address")]
        [Required(AllowEmptyStrings = false, ErrorMessage = "Please Provide Agency Category Name")]

        public string Address_01 { get; set; }

        public virtual Agency_Category_Master Agency_Category_Master { get; set; }
        public virtual Region_Master Region_Master { get; set; }

        public virtual List<agency_embargo_details> Agency_Embargo_Details { get; set; }
        public virtual List<agency_gstn_details> Agency_GSTN_Details { get; set; }

    }
	
public class Agency_GSTN_Details
    {
        public int Agency_GSTN_Id { get; set; }
        public int Agency_Id { get; set; }
        public string GSTN { get; set; }

        public int SlNo { get; set; }
        public Nullable<system.datetime> Created_Date { get; set; }


    }

What I need is:

during edit mode, multiple Agency_Gstn_Details should be added, edited or deleted before the final submit. this list should be shown in table.

the gstn details should be added using a textbox and button.

for editing the record is selected from the table row and shown back in textbox to update the list.

Please help to achieve the above.

What I have tried:

I can show the model details in edit mode now. But confused in adding and editing records in table for gstn details before save.