Hello Pradeep,
if i understand your requirement correctly
Portal roles or groups can imported via standard template file(don't use .CSV file)
and role types as Single with landscape type as EP.
Once data is imported need to make some changes at "Assign group parameter mapping"
if you have not referred,please check
1840613 - Groups are not getting assigned to users on Portal
1762514 - Group provisioning fails for portal with error message 'Cannot find a SPML request'
Regards
Baithi