Customise product page add another add to cart option

Hello All! I need to customise one of my product pages.

I want to add an option where you can add on an extra print for £10 - like this store does...

http://www.helenpenny.co.uk/shop/petpillow

Any ideas??

These are Product Variants.

When you create multiple variants, they appear in separate drop-down menus on a product's page. When setting this up, you'll add a new row in the product editor for every possible combination of options.

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great thanks I think I've got it 🙂