How to make relationship in django models in such scenario

models.py So,here i want to make Invoicemgmt model in which i can have multiple entries for Invoice table having customer,project and Invoice_amount.

Basically,requirement is that whenever i see 'view_Invoice' of some id,first i will see all data of that specific id on that page and then i want to have small table below for invoice_mgmt,where i can add amount received for that specific id invoice.

*so,i want to know what fields should i add in invoice_mgmt model for relationship "

"models.py"

class Invoice(models.Model):      company_choice = (          ('VT_India', 'VT_India'),          ('VT_USA', 'VT_USA'),      )      company = models.CharField(          max_length=30, blank=True, null=True, choices=company_choice)      customer = models.ForeignKey(Customer, on_delete=models.CASCADE)      project = models.ForeignKey(Allproject, on_delete=models.CASCADE)        invoice_title = models.CharField(max_length=15)        invoice_id = models.IntegerField(primary_key=True)      invoice_amount = models.IntegerField()      invoice_date = models.DateField(          blank=True, null=True)      invoice_duedate = models.DateField(          blank=True, null=True)        invoice_description = models.TextField()        def __str__(self):          return self.invoice_title      class Paymentmethod(models.Model):      paymentmethod_id = models.IntegerField(primary_key=True)      paymentmethod_name = models.CharField(max_length=15)        def __str__(self):          return self.paymentmethod_name      class Invoicemgmt(models.Model):      invoicemanagement_id = models.IntegerField(primary_key=True)      invoice_received = models.IntegerField()      date = models.DateField(          blank=True, null=True)      payment_method = models.ForeignKey(Paymentmethod, on_delete=models.CASCADE)

  "So, basically i want to have multiple entries in invoice mgmt table for one specific invoice table id(one specific data)"    

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