If you have read job description carefully, write "Hobi" at the top of proposal
On our Shopify store we require the ability to let a customer add their initials to the product before adding to the basket.
If the customer wants this option there is an additional charge.
This is only for certain products so a separate product template must be produced to attach to those products where it is an option
Ideally the customer should only be able to enter the initials after they have selected the extra charge.
We prefer to develop this customisation within the theme rather than with an additional app because it gives us more control over the site.