How to Change Part Axes Orientation

Is there a way to change the orientation of a part's base axes?  I am working to generate CNC milling code and most of the faces that I need to machine are perpendicular to the part's Y-axis, but I need these faces perpendicular to the part's Z-axis?  Does anyone have advice on how to change the base axes orientation?  Simply adding a coordinate system and orienting it how I need the base axes to be oriented does not fix my issue.  Thank you.

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