Maybe I'm just confused, but I think you're basically there. Just move your form to another display function..

#!/usr/bin/perl

use CGI;
print $q->header();

%formvals = $q->Vars();
my $repaccess = $formvals{cvsrep};
my $repfunction = $formvals{function};

if($repfunction =~ /Register_User/) {<br>
  print $logo;
  &displayreg($repaccess);                    
} elsif ($repfunction =~ /Delete_User/) {            
  print $logo;
  &displaydel($repaccess);
} elsif ($repfunction =~ /Show_All_Users/) {
  printf $logo;
  &showallusers($repaccess);
} elsif ($repfunction =~ /Reset_Password/) {
  printf $logo;
  &displayreset($repaccess);
} else {
  displayform();
}

sub displayform{
  printf "<h1>CVS User Management</h1><br>";
  printf "<P>";
  printf "<b>Please select which cvs repository your would like to adm
+inister.</b><br><br>";
  foreach my $rep (<@reps>) {
    printf $q->radio_group (-name => 'cvsrep',<nt>
                            -values  => [$rep],
                            -linebreak => 'true');
  }
  printf "<br>";
  printf "<b>Please select the function to use. <br></b><br>";
  my @functions = ('Register_User','Delete_User','Show_All_Users','Res
+et_Password');
  foreach my $func (<@functions>) {
    printf $q->checkbox_group (-name   => 'function',<br>
                               -values => [$func],
                               -linebreak <br>=> 'true',
                               -defaults => 'other');
  }
  print "<br>";
  print $q->reset;
  print $q->submit ('Submit', 'Submit');
  print $q->endform;
}

sub displayreg { ... }
[download]