You can now import users into the Manage Users section.
Head to the Business Management section in Payroll Settings and select Manage Users.
It is best practice to first add a restricted user manually, then export the data using the Export button on the screen. This will provide an excel document for you to add the rest of your users and the levels of access they should be given.
Once complete, import your users and they will be given access just the same as if you had manually entered the details
For more information: Creating a Full or Restricted Access User