Sept 2016 Facebook page follow another page
Facebook has quietly changing how a business page can follow a different business page. This changed about 6 months ago, and again they've changed with out any announcement. Annoying! However, this time they may have gotten it right. It's super simple now and actually requires far fewer clicks. So, here you go.
1) Log in to Facebook.
2) Find the page you want to follow.
3) On the cover image of the page you want to follow go to the ...more button. Careful here, just HOVER over the ellipses ... .
A window will open and just click the LIKE AS YOUR PAGE. If you have multiple business pages, you'll be given the option to choose which page you want to "like as".