template_problem.pp

node "mymachine" {
   include main
   class {
     "main::extra":
       myparam => "variable";
   }
}

class main {
  file {
    "/etc/sysconfig/myfile":
      ensure => present,
      content => template("myfile.erb");
  }
}

class main::extra {
  file_line {
    "option1":
      path => "/etc/sysconfig/myfile",
      line => "OPTION+=\"--option=${myparam}\"",

    "option2":
      path => "/etc/sysconfig/myfile",
      line => "OTHER=\"${myparam}\"",
  }
}