If you want to keep you CSS you do not need the child theme. You can place all the CSS in the Theme Settings > Custom CSS. Each time you update the theme, make the full backup of your site, and update the theme following these instructions: https://xtemos.com/docs/woodmart/update-theme-2/ and everything would remain after the update.
If you still want a child theme, you can find it in the Theme folder on the Themeforest.
Thank you for the fast reply. I just want it in a extra child.
Can you tell me whats the name of the file.
As you said im in : wp-content-> themes -> woodmart -> ?
I just want the css in a separate document. Not in the editor within the theme. Thats the reason i asked for the file destination.
I dont know what you mean with finding the child theme. Can you claify?
The css need to be in a document on the server. That was the main question.
The integrates custom css part needs to go into somewhere
I just need the file name