I have a Cartosat 2.5 m Imagery and Block files along with DSM Data. I wanted to generate DEM using Leica Photogrammetry Suite Software. Does anyone know the steps of generating same?

I have to edit the existing DSM by augmenting with more breaklines / masspoints and editing of existing points to the exact ground surface as visualized on the stereo data supplied.

Also is DSM also in black/white color or is there a way to change bands and update the colors?

How can I perform the same on LPS Software?