From One Page to Another
This used to be a little more complicated, but with some simple text changes, Facebook has made this action a whole lot simpler to execute upon. If you’re already logged in, just visit the page that you’re interested in liking from your own page. On the upper righthand side of the page, you will see the option to like, as well as a button that just has …Like button, you will be liking that page from your personal account. If you click the … to reveal more options, you should find what you are looking for.
Select “Like as your page” to correctly Like the page from your own page, and not that of your personal account. Facebook will ask you for confirmation of the like.
By confirming your like of the page, that page’s content may from time to time show up on your page’s timeline, so choose carefully.