addition cost

[daninap]

Hi all I have created an e-commere to sell investments.
Some products need to add another item like "Initial Printing Cost" 50 €.
How can I show this product as a selection when choosing the item?


Also I should attach a PDF file to download page of the carreel I can show an article where I insert the link of the PDF maybe as a button (not necessarily) or there is something that allows me to do it only in the cart?

[hellorain]

Hello,

You can use custom attribute along with product which will also carry with add to cart attribute.

Best Regards,
hellorain.

[daninap]

I try