hi I have a site with it's own domain as so "mysite.com" in about two weeks it will move to a sub domain of another domain I have as so: "mysite.oneofmydomains.com" "oneofmydomains.com" is not a new domain, its an 8 years old domain. I know it's looks crazy but I can't really change it.... the only thing I can do is move it to a folder under that same domain as such "oneofmydomains.com/mysite" but that's not better is it... how can I "tell" google about this change so that he understand it is the same site that just moved ? and thus minimize the SEO damages ?
make .301 redirect from all old articles to new website articles and you will not lose anything! For wordpress You have plugin or you can use .htaccess redirect.