Create in Erdas Imagine Photogrammetry file with some documented process description

I'd like you to create Erdas .blk file (Imagine Photogrammetry) from GeoTIFF Drone Images with CAM file . I'd like the .blk file to be ready to use in Erdas Stereo Analyst Project. Once blk file created I'd like to understand the creation process and some document with process description (simple one)