Using wildcards can speed up the creation of your source data, below the the wildcards included by default. You can create your own by clicking the Settings ribbon and then Wildcards.
%username% (reads the value found in the sAMAccountName column)
%firstname% (reads the value found in the givenName column)
%lastname% (reads the value found in the sn column)
%givenName% (reads the value found in the givenName column)
%sn% (reads the value found in the sn column)
%sAMAccountName% (reads the value found in the sAMAccountName column)
%userPrincipalName% (reads the value found in the userPrincipalName column)
%initials% (reads the value found in the initials column)
%email% (reads the value found in the mail column)
%firstNamefirst% (reads the first letter of the value found in the givenName column)
%firstNamelast% (reads the last letter of the value found in the givenName column)
%lastNamefirst% (reads the first letter of the value found in the sn column)
%lastNamelast% (reads the last letter of the value found in the sn column)
