If I change my shopify from one theme to another, can I import all the info from one to the other or do I have to design from scratch?
Pretty much yes, if the theme is from the same developer you may be able to copy the settings_data.json configuration file and transplant it into the new theme to try and minimize redo’ing every setting. For example Shopify makes the Dawn theme and it’s offshoots like Craft-theme , Sense-theme etc ; so they share some underlying settings but also have varying feature sets.
This will also generally highlight information architecture problems with how/where a sites data has been structured or inflexible apps or theme-customizations.
An example is if you have hardcoded text values for a product faq in settings instead of setting up a metafield definitions per product to be able to use dynamic sources.
If you need theme migrations services then contact me directly for services.
Please provide context: store url, theme name, post url(s) and any further detail.
Contact Info in signature.
Good Hunting.
what “info” are you referring to? anything outside of the Themes section is universal and everything you do/change within the Themes section would be changed to the new theme’s base layout until you make changes in the theme editor or within the code of that specific version of that theme.