Converting Grid Coordinates from "UTM Zone 36N" to "Pseudo Mercator 3857" - Forum - Delft3D Flexible Mesh

Sine i have many projects already conducted in Delft3d with a great efforts already done in generating the grid in our zone coordinate. So, i was trying to convert the "Grid" file to "Pseudo Mercator 3857" coordinate which is being used in Delft3d-FM, However conversion is available for LDB and samples files, but not for "Grid file" whether regular or irregular type. I have also tried to convert the grid using "Super trans" however, its not AVALIABLE for "Pseudo Mercator 3857" coordinate.I am using version 1.4.3