So I would like to add a ‘sticky add to cart’ banner which will include a price and a button which will take back to the top of the page so variants can be selected.
Tried using a walk through video, but was for flex theme and not superstore them.
I understand you are looking to provide a sticky ‘Add to cart’ button with product price and option to select variants in your store product detail page.
You can implement this functionality by using the below mentioned shopify app -: