Process to be followed:
Step 1 : In Income Income Tax Software - Go to Reports → MIS → MIS option given in the menu bar.
Step 2 : Click on the option Assessee Register given in left panel of the screen.
Step 3: Now all client details will be displayed, click on excel symbol for exporting data in the excel.
Step 4: Select location and save with file name
Now, check the assesse register exported in the excel