in cad, we have to do repetitive tasks manually again and again. we can use the trail files to do such task just at a click by using those set of instructions stored in trail files. let us see how i have created 40 parameters using a trail file. this was a project requirement and we use to have a set of defined parameters in creo. any set of commands can be used to automate the process for example to export the thousands of creo drawings in pdf and tiff images. with the python and trail files there is no limit for automating the tasks in creo.