I have purchased a theme "reformation" and I want a thumbnail carousel on my product page for product images, but the theme does not have the feature to do so, I even tried installing apps, it does not work, but is there any modifications in the code...

Will i have to buy two plans or a single basic plan 

The two stores are different from each other and I have a domain for each . I'm confused between basic plan & shopify plan, can you please guide which plan will allow me to do the necessary 

I am creating two stores with two different domains for each so which plan should I buy Basic plan ₹1,994 INR/month or the Shopify plan ₹7,447 INR/month

I am creating two stores with different domains so which plan should I buy Basic plan ₹1,994 INR/month or the Shopify plan ₹7,447 INR/month