I would like to activate a child theme I have created on a site where I am using parent theme then that the child theme was built for.
The problem I am facing is that I am unable of changing the theme options, page templates, widgets and menu without activating the theme or I don't know how.
I built the child theme on a test server. I know that there are some plugins that help with designing with live site like http://wordpress.org/extend/plugins/theme-test-drive/ but I don't think I am looking for that as my child theme is ready.
The content on my test site is not perfect so that's why I don't want to copy it over to the live site.
Thank you for any suggestions. I do think I know some stuff about WordPress so dont feel you need to dumb anything down.