Want to create Child theme, but already edited Parent theme css files and some php files

In case you have access to the original theme files you can compare them using a tool for that purpose such as this, then when you identify which are the modified files you load those files to your child theme.

This way you only have the modified files on your child theme and it won’t matter if any update happens after that.

If you progress so far isn’t that big or that important you can analyze to see which option is more time-consuming, doing this or starting over with a new theme.

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