// variant 1
public class AllCatalog
{
    private Dictionary<Table, SPR>;
}

public class Table
{
    public string Name { get; set; }
    public string NameTable { get; set; }
}
// variant 1 end

// variant 2
public class AllCatalog
{
    private List<Table>;
}

public class Table
{
    public string Name { get; set; }
    public string NameTable { get; set; }
    public List<SPR>;
}

// variant 2 end


public class SPR
{
    public string Kod { get; set; }
    public string Text { get; set; }
    public override string ToString()
    {
        return Text;
    }
}
public class SecondSPR : SPR
{
    public string Current { get; set; }
    public string Vid { get; set; }
}