Hello! when i sell a product, i want people to be able to then select an add on - (through variants maybe?), and then if they do, have a field for “special instructions” appear for them to specify .
how can i do this?
rollingbeetledice.com.au
Beetyboi
id rather solve it here so that people can see
it’s above 
This can be achieved using infinite option APP.
To implement this using custom code in theme you should go for hiring someone like us.