Make custom Shift Grid


I ´ve got one question.

I would like to make my own shift grid for national conversion between new an old datum (and reverse). I ´ve got an xls file with X, Y coordinates and their dX and dY. Is there any chance to make own shift grid in Bentley map or I will need other software.

I have read something about GSB files in GeoCoordinateData ( but I don't  know if those files uses same values (X,Y,dX,dY) or they are completely different.

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