Hi Robert, sorry as I thought I would have gotten email notification of your replies so I thought someone would have forgotten me.
What I meant was something like below:
1. ADD TO CART button .. once the customer adds that product into the basket once
2. The ADD TO CART button now changes to “- quantity +” button.
As currently we can set allow quantities but then it always shows quantitates option by default and on the mobile (small screen) sometimes trying to tap on + or – signs it goes to the input text box instead and ask the user to input the quantity in