“Import Steps” feature within a request provides the ability to import only the following fields (https://docs.bmc.com/docs/display/public/brpm460/Managing+steps#Managingsteps-Toimportsteps)
Owner of the step — a group or a user that you want to associate with the step
Note: For users, enter the user's first name and then the last name.
Automation script name
Name of the component for the step, that is assigned to the request environment
Information to describe the deployment task for which you are creating the step
Estimated duration of the step in minutes
Name to identify the step
Start Date and End Date are critical fields and should be available for users to import – Typically, release deployment plans are 100 + tasks.
Import Steps helps when importing from an excel sheet or a CSV - however, the lack of start and end date import, forces the user to go to each step on the request, click it, and then select the start and end dates.