A few ways, the easiest is probably drilling through your piece in a few places and in to your sacrificial table (assuming you are using a router with one) will allow you to flip the piece and secure with pins in the same place.
You just have to make sure in your cam software that things are right based on flipping. The other which works well is to machine half and cut it out of your timber as a rectangle. Then pocket that sized rectangle in to your table where you can tap in your piece to machine the other side.
I know what I mean, hope it makes sense on written down
Depending on your software it can automate parts of your two sided machining to make things easier.
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