adding subpages to Facebook page?

I see it done on other sites, but I can't figure it out. Only subpages I can add are default Facebook ones. Below they were able to add stuff like "Lake Fork Conditions" and "Lake Fork Guides". Thanks.

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that's awesome, why didn't I ever know about that!?! I haven't tried to add a page yet, but I set up account and it automatically accepted the two Facebook Pages I wanted. thanks!

 

OK, so I hate Facebook calls sites Pages, appears everything there is adding a new site (Pages) and not a subpage. Still not sure how to add a subpage in your page.