I have a date and time shown under my products page, once a customer selects that then in checkout I need the quantity to e selected not in the products page. How do I change that? Right now a customer can select the same date and time as long and the quantity is not all selected.
Only stores on a Shopify Plus plan ($2k/mth) are allowed to modify checkout.
Trying to shift this to checkout is the wrong approach handle this on the product description page itself.
Make the date a required input so the product cannot be added to the cart without it.
To make it clear to users there are steps involved a further customization would to be to hide/disable the quantity input until a date is added; possibly either putting them in accordions or adding step numbers , depends on business context though.
An alternative is remove the quantity from product pages, and force a quantity confirmation in the /cart when there is only 1 quantity,etc.
All cart items have 1 quantity by default to exist, there is no such thing as 0 quantity cart line items.