Where can i find and how do I use the Multi Select Tool?

I've seen so many times in videos that the users copy whole building parts at once an now I've known that they use the "Multi Select Tool" ... but maybe that sound stupid .... where can I find this tool???? And how I use it?

Thanks for any help in advance.
 
There was an option in Alpha 2, that was ued by Silvaret or Rudi rennkamel on their massive buildings (Rudi mentioned that tool using for his Cologne Cathedral)
 
when your in edit building mode you can click and drag to select multiple objects, you might have to hold ctrl im not sure tho
 
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