First of all, you need to have an installed theme on your store(
root/themes folder) that will be used as a parent for your child theme. Create a new folder in
/themes folder( For example: childtheme) copy below files from parent theme folder to child theme folder
├── config │ └── theme.yml └── preview.png
theme.yml file of child theme and specify which theme should be used as a parent.
parent: classic name: childtheme display_name: My first child Theme version: 1.0.0 assets: use_parent_assets: true
Now go to back office where you can see a new child theme will appear and you are all set.