If you need to choose which product you would like to publish, we have a button to enable only product you want to sell and which you don't want.
Or if you are looking to sell only specific product among the list of products,
you can set your preferences in the settings tab, so when you upload artwork,
it will just auto enable those products you want to publish. It would be less work for you.
For this option, you can go to Settings >> Preferences, then scroll below and enable the products needed.