Video: https://youtu.be/ttMOV1_fbLo
Important items to note before proceeding with reading Multiple Choice Add On explanation.
This option should only be used if you need the customer to choose an option where you do not need to manage stock. If you need to manage stock, you must use attribute & variations section.
Multiple Choice Add Ons
Customers choose only one option from a set of predefined options. For Example: Color or size.
Title: Format the title as a Label or Heading, or hide it.
Display as: Choose how to present options to customers. Display as Dropdowns, Images, or Radio Buttons (see below).
Add description: Displays more information about the add-on underneath the heading.
Required field: Prevents product from being added to cart if an option is not selected.
Options: Add a label for each option as well as a price if needed. Calculate the price as a flat fee regardless of quantity, per quantity ordered, or, charge a percentage of the total. To remove an option row, click the ‘X’.
Note: You must add a Label for each option, so the information shows when viewing the order and is passed through in the confirmation email to the customer.
If the display option is set to images, an image upload icon will show up next to each option.
Website display
Radio buttons:
Dropdown
Images
Checkboxes
Customers choose one or multiple options. Examples: Gift wrapping, card, or upgrades. 
Title: Format the title as a Label or Heading, or hide it.
Add description: Displays more information about the add-on underneath the heading.
Required field: Prevents product from being added to the cart if an option is not selected.
Options: Add a label for each option as well as a price if needed. Calculate the price as a flat fee regardless of quantity, per quantity ordered, or, charge a percentage of the total.
Note: You must add a Label for each option, so the information shows when viewing the order and is passed through in the confirmation email to the customer.
Website display
