I have a second garden which is on the other side of the building and I cannot connect to the boundary wire. Can I buy a second station separately (where and how?) and can the mower be taught on both stations with 2 separate loops?

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In this case, you must set up a side area. However, the mower must be carried there. As far as I know, a second station is not possible because you cannot have 2 different guide cables. 
Here you can find out everything about secondary areas:
https://www.youtube.com/watch?v=w4aCUhLxzEM

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Question about Gardena Sileno City 250

I have a second garden which is on the other side of the building and I cannot connect to the boundary wire. Can I buy a second station separately (where and how?) and can the mower be taught on both stations with 2 separate loops?