How to combine two flat lists into one nested object

Question

I have three lists which contains three same properties in each collection. I want to combine a result into one collection. Ex classes structure is as below

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Answer 1

I have solution, but i am not sure if it's ok for you. It depends on data format that you have on the begining.

solution:

class Program
{
    static void Main(string[] args)
    {
        var collection1 = new Collection1() { PropId1 = 1, PropId2 = 2, PropId3 = 3 };

        var list2 = new List()
        {
            new Collection2
            {
                PropId1 = 11,
                PropId2 = 22,
                PropId3 = 33
            },
            new Collection2
            {
                PropId1 = 22,
                PropId2 = 33,
                PropId3 = 44
            }
        };
        var list3 = new List()
        {
            new Collection3
            {
                PropId1 = 111,
                PropId2 = 222,
                PropId3 = 333
            },
            new Collection3
            {
                PropId1 = 222,
                PropId2 = 333,
                PropId3 = 444
            }
        };

        var result = new ResultCollection(collection1, list2, list3);
        //or
        var result2 = new ResultCollection(collection1) //but in this case you have to change your constructor
        {
            Collection2s = list2,
            Collection3s = list3
        };
        Console.ReadLine();
    }
}

public class Collection1
{
    public int? PropId1 { get; set; }
    public int? PropId2 { get; set; }
    public int? PropId3 { get; set; }
}
public class Collection2
{
    public int? PropId1 { get; set; }
    public int? PropId2 { get; set; }
    public int? PropId3 { get; set; }
}
public class Collection3
{
    public int? PropId1 { get; set; }
    public int? PropId2 { get; set; }
    public int? PropId3 { get; set; }
}

public class ResultCollection : Collection1
{
    public ResultCollection() { }

    public ResultCollection(Collection1 collection, List list2, List list3)
    {
        foreach (PropertyInfo prop in collection.GetType().GetProperties())
        {
            PropertyInfo prop2 = collection.GetType().GetProperty(prop.Name);
            if (prop2.CanWrite)
                prop2.SetValue(this, prop.GetValue(collection, null), null);
        }
        Collection2s = list2;
        Collection3s = list3;
    }

    public List Collection2s { get; set; }

    public List Collection3s { get; set; }
}

But can you give an example of input data?