All of our themes come with a Default page template and a set of predefined page templates that you can use to get started. By default, all pages are assigned to the Default page template.
Any changes you make to a template will impact all pages that use that template. If you want to display some pages of a particular template differently, then you can create a new template based on one that already exists in your theme.
Create a new page template
In the theme editor, click on the page selector at the top of the page, then click on Pages, and then click Create template.
In the Create a template modal, enter a name for the new template in the Name field. Under Based on, select the template you want to base your new template on, then click Create template.
Once the new template is created, you can start adding the sections you want to display on the page.
To assign pages to a created template, open the page in your Shopify admin and select the template from the Template dropdown.
Note: Not seeing your new template in your page's template dropdown? Shopify only allows templates from the published theme to be assigned. Before publishing you can still use the editor to preview your new template.