在ABP框架中，一对多关系可以通过以下步骤来实现：

1. 定义实体类：

public class Book : Entity
{
    public string Title { get; set; }
    public ICollection AuthorBooks { get; set; }
}

public class Author : Entity
{
    public string Name { get; set; }
    public ICollection AuthorBooks { get; set; }
}

public class AuthorBook : Entity
{
    public int AuthorId { get; set; }
    public Author Author { get; set; }

    public int BookId { get; set; }
    public Book Book { get; set; }
}

2. 配置实体关系：

public class BookStoreDbContext : AbpDbContext
{
    public DbSet Books { get; set; }
    public DbSet Authors { get; set; }

    public BookStoreDbContext(DbContextOptions options) : base(options)
    {
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity()
            .HasKey(ab => new { ab.AuthorId, ab.BookId });

        modelBuilder.Entity()
            .HasOne(ab => ab.Author)
            .WithMany(a => a.AuthorBooks)
            .HasForeignKey(ab => ab.AuthorId);

        modelBuilder.Entity()
            .HasOne(ab => ab.Book)
            .WithMany(b => b.AuthorBooks)
            .HasForeignKey(ab => ab.BookId);
    }
}

3. 使用一对多关系：

public class BookAppService : ApplicationService
{
    private readonly IRepository _bookRepository;

    public BookAppService(IRepository bookRepository)
    {
        _bookRepository = bookRepository;
    }

    public async Task CreateBookWithAuthorsAsync(CreateBookDto input)
    {
        var book = ObjectMapper.Map(input);
        book.AuthorBooks = new List();

        foreach (var authorId in input.AuthorIds)
        {
            book.AuthorBooks.Add(new AuthorBook
            {
                AuthorId = authorId,
                BookId = book.Id
            });
        }

        await _bookRepository.InsertAsync(book);
    }
}

以上是一个简单的示例，展示了如何在ABP框架中建立一对多关系。具体的实现可能会根据你的业务需求和数据库设计略有不同。