How to copy machining from left to right?

How to copy machining from left to right?

Hello Guys!
I have to creat a machining at both side of my Adjustable Shelf, 
I did success to creat a "3 sided Notch" under "Part Properties" for the left side of my shelf. What should i do next for creating the same machining for the right side of my shelf?

    MVU eLearning



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