Can I add a multiple choice in a product inside a purchase order form?

Can I add a multiple choice in a product inside a purchase order form?

The format in the following picture will work, but I want to charge only $390 regardless of how many flavors they add.

This is a package that includes several ice cream flavors and its cost is 390.

Yes, it's possible. Just enable the special pricing and set the amount to 390.

I hope that helps. Let us know if you have any questions or if you need further assistance.