Invoice bill creation for the specific customers in billing software django forms

i am trying to create a invoice bill for the specific customer , first on the bill customer selection should be available for the selection of the customer , after that we are giving the option to add the items which are taken from the product app along with quantity input option . how can i implement this things using the django and dajngo forms i tried to do this but i am just able to implement the only customer selection option but not of items selection from the product i am giving the my codes of models.py form.py and views.py

models.py:
from django.db import models
from customer.models import Customer
from product.models import Product
# Create your models here.
class Invoice_customer_list(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)
    # date = models.DateField(auto_now_add=True)
    # total_amount = models.DecimalField(max_digits=10, decimal_places=2,default=0.00)


    def __str__(self):
        return f"Invoice # {self.id} -{self.customer.name}"
    
class Invoice_product_list(models.Model):
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.PositiveBigIntegerField()

  forms.py:
from django import forms
from .models import Invoice_customer_list,Invoice_product_list,Product



# Form for the Invoice model
class Invoice_customer_Form(forms.ModelForm):
    class Meta:
        model = Invoice_customer_list
        fields = ['customer']
        labels = {
            'customer': 'Select Customer',
            
        }

class Invoice_product_form(forms.ModelForm):
    class Meta:
        model = Invoice_product_list
        fields = ['product', 'quantity']
        labels = {
            'product':'Select Product',
            'quantity':'Enter quantity',
        }
    

views.py :
from django.shortcuts import render,redirect
from .forms import Invoice_customer_Form,Invoice_product_form

# Create your views here.
def create_invoice(request):
    if request.method == 'POST':
        form = Invoice_customer_Form(request.POST)
        form_products = Invoice_product_form(request.POST)
        if form.is_valid() and form_products.is_valid():
            form.save()
            form_products.save()
            return redirect('invoice_success')
    else:
        form = Invoice_customer_Form()
        form_products = Invoice_product_form()
    return render(request, 'invoice/create_invoice.html',{'form':form,'form_products':form_products})

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