How do I add and implement my function into a menu

Question

def main():
    
    while(True):
        print(f'********Library Management System*********')
        print(f'1 - Add Book')
        print(f'2 - Remove Book')
        print(f'3 - Issue Book')
        print(f'')
        print(f'******************************************')
        user_choice = input()
        if user_choice not in ['1','2','3','4','5','6','7']:
            print(f'Please enter a valid option. ')
            continue
        else:
            user_choice = int(user_choice)
            
         
        if user_choice == 1:
            book = input("Please Enter The Name of The Book You Want To Add :")
        
        elif user_choice == 2:
            pass
        
        else:
            print("Not A Valid Option.")
            
        print("Enter End to QUIT or Return for MENU page.")

        while(user_choice2 != "End" and user_choice!="Return"):
            user_choice2 = input()

            if user_choice2 == "end":
                exit()

            if user_choice2 == "Return":
                continue

This is my menu lay out so far and I can't use GUI so I have to do it as text-based so I have a function called add book which is

def addbook(self, name, author, pages, publise_date):
        b = Book(name, author, pages, publise_date)
        Catalog.Books.append(b)
        Catalog.different_book_count += 1
        return b

But I don't know how to make it so that if the person picked 1 in the options menu they would then be given the option to add a book to the array in another book class which would be

class Book:
    def __init__(self, name, author, publish_date, pages):
        self.name = name
        self.author = author
        self.pages = pages
        self.published_date = publish_date
        self.total_count = 0
        self.book_item = []
        
    def addBookItem(self, isbn, rack):
        b = BookItem(self, isbn, rack)
        self.book_item.append(b)
        self.bookcount += 1
        
    def printBook(self):
        print(self.name, self.author)
        for book_item in self.book_item:
            print(book_item.isbn)
            
            
    def searchBookItem(self, isbn):
        for book_item in self.book_item:
            if isbn.strip() == book_item.isbn:
                return book_item
            
    
    def removeBookItem(self, book_item):
        if book_item in self.book_item:
            self.book_item.remove(book_item)
            self.total_count -= 1
            
            
    def __repr__(self):             #The __repr__ method returns the string representation of an object that is machine-readable.
        return self.name + ' ' + self.author
    #gives name and suthor of the book
    #Implement the __repr__ method to customize the string representation of an object when repr() is called on it.

This is imported into the user code which is where the menu and 2 classes for member and library emp are but I am now stuck on as to how I put this in to my menu