whiterabbitzero

Hey all.....So I am very new to this and am trying to learn the ropes. So I've opened my parks from RCT2 into OpenRCT2. I am not sure how to add rides and attractions in one park that only has certain rides and or themes. Example: Great Wall of China you can only build certain rides so if I wanted a 3D Theater or Sideways coaster I can't build those in that park. So my question is.....how the heck do I do that?