So I have got a base theme that is being used across multiple sites, but am wanting to add subtle tweaks to certain sites and was wondering what would be the best way to go about it.
I have created a sub-theme, which works fine. But, in order for it to work I need to bring all the files over from the parent theme, although I'm only changing the CSS. I thought it would use the files in the sub-theme and any files not in that folder just use the parent themes files.