Framwork/Assets/Scripts/Runtime/UI/Data/ShoppingCart.cs

using System.Collections.Generic;

namespace Runtime.UI.Data
{
    public class ShoppingCart
    {
    }

    public class ShoppingCartData
    {
        public List<BookColorData> bookColors = new List<BookColorData>();
        public List<BookLineData> bookLines = new List<BookLineData>();
    }

    public class BookLineData
    {
        public string bookLineName;
        public string bookLineDescription;
        public int bookLineCount;
    }

    public class BookColorData
    {
        public string bookColorName;
        public string bookColorDescription;
        public int bookColorCount;
    }
}