I need help combining the two projects below and submitting them as one single application project 

Using Windows Form Visual Studio 2019. C#

Person and Customer Classes

Design a class named Person with properties for holding a person’s name, address, and telephone number. Next, design a class named Customer , which is derived from the Person class. The Customer class should have a property for a customer number and a Boolean property indicating whether the customer wishes to be on a mailing list.  Demonstrate an object of the Customer class in a simple application.

PreferredCustomer Class

A retail store has a preferred customer plan where customers can earn discounts on all their purchases. The amount of a customer’s discount is determined by the amount of the customer’s cumulative purchases in the store as follows:
• When a preferred customer spends $500, he or she gets a 5 percent discount on all future purchases.
• When a preferred customer spends $1,000, he or she gets a 6 percent discount on all future purchases.
• When a preferred customer spends $1,500, he or she gets a 7 percent discount on all future purchases.
• When a preferred customer spends $2,000 or more, he or she gets a 10 percent discount on all future purchases.
Design a class named PreferredCustomer , which is derived from the Customer class you created in Programming Problem 4. The PreferredCustomer class should have properties for the amount of the customer’s purchases and the customer’s discount level. Demonstrate the class in a simple application.

I would prefer the application to be interactive and use a TabControl to make it interactive and use a similar coding to what I’m use to so I can use it as a reference for my final project.