Bulk import to a permissions group


Is there a way of doing a bulk import of users to a group? For example if I create a new group with curtain permissions and want to import a large number of people that are existing users on Smartsheet into that group can this be done? That also goes for bulk importing new users directly into a group instead of doing a bulk import from an CSV file into the standard user list and then having to manually add the users to the groups I would like them in? 

As an F.Y.I - i am currently on a Business plan not Enterprise.

Any advice would be much appreciated