Automated HEC-HMS Data Entry in General Hydrology Posted July 13, 2017 · Report reply I'm having trouble with entering large quantities of data into HEC-HMS while avoiding copy+paste errors. I am currently using HEC-DSSVue, which allows me to enter data for multiple subbasins at a time. Unfortunately, I still have to enter data separately for each month. I was looking in to making my own DSS files, or using a code to go in and directly edit my DSS files, but I'm still having trouble figuring it out. Does anyone have any tips, or their own method for entering a lot of HEC-HMS data at once (without introducing many opportunities for human error)?