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If you go 20 sec back, he shows you how to make them.

(+1)

Oh no I know how to creat an or gate with 3 pins. My question is how to integrate my OR3 and OR4 with the original OR gate like the following screen.

I'm sorry about my bad english, it's not my first language.

Oh I did not know what you were talking about, sorry! 

That feature is sadly not yet possible. Although Sebastian (the developer) did make a chip library for us, which could still be polished a bit better by adding folders or such.