How do I combine a custom coaster with buildings and scenery?

I see some amazing coasters with beautiful buildings and scenery that people have created. I tried doing this in sandbox mode but my coaster is separate from the building and scenery that I created around it (part of my coaster goes through the building). When I try to save as a blueprint, I have to do it as two separate blueprints; the coaster by itself, and then the building with scenery. How do I combine them into one blueprint? Thanks for any help as this has been driving me crazy.
 
I see some amazing coasters with beautiful buildings and scenery that people have created. I tried doing this in sandbox mode but my coaster is separate from the building and scenery that I created around it (part of my coaster goes through the building). When I try to save as a blueprint, I have to do it as two separate blueprints; the coaster by itself, and then the building with scenery. How do I combine them into one blueprint? Thanks for any help as this has been driving me crazy.

In the right bottom screen you have the selection tool. Drag and select all scenery, the coaster and de building you want in the blueprint then @ the right top corner click save as blueprint [up]
 
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