How do I duplicate multiple extrusions?

I have a part I'm making and want to duplicate three extrusions. I believe I want to use the mirror feature, but can't figure it out. The extrusions I want to duplicate are named "hole" and want I them placed equidistant on the opposite end. Here is as link to my project trash part | Part Studio 1 (onshape.com)

I'm very new to this....Thanks

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