how do l create a custom geoid/vertical transformation using global mapper or Geographic calculator

I have some images from an eBee X drone whose positions have been calculated by reducing the flight log file and a rinex file from a gps. so l have xyz coordinates but the heights are Elipsoidal heights and what l need are orthometric  heights. There were No GCPS used in the project but l have about 6 or 7 points measured in the project which have both elipsoidal ansd orthometric heights. How do l create a custom geoid or vertical transformation to transform the Z value of my point cloud after processing


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