Templates in Shopify are a group of sections arranged to give your store a consistent design and feel. The sections you can include in your templates depend on the theme you are using.
When you rearrange a template, your changes apply to every page that uses the template. If you decide to mass-change the templates for a set of products, it would be very convenient to set the templates per product from a spreadsheet app like the Mixtable Spreadsheet Editor instead of going to the product pages one by one via the Shopify admin.
Here’s what the manual change looks like:
The Mixtable Spreadsheet Editor app makes it easy to edit Shopify data in one place. Changes can be easily synced back to your Shopify store with just a click. You can use spreadsheet functionality like sorting and filtering and bulk editing like find and replace, changing prices with certain percentages, and more.