export full with no data and import only Object definitions of the users you wanted with ignore=y option which grants all the privileges and roles to those users.

export userid/password full=y or users=user1,user2 and rows=n
import userid/password ignore=y
fromuser=user1,user2
touser=user1,user2

[Edited by sreddy on 01-02-2001 at 04:42 PM]