Here you go!
1. Copy and paste the code below into a new file, ie. custom.php
2. Upload the file to your ListMail folder
3. Browse to it
<?php// place this script in your ListMail folder and browse to itinclude('./config.php');include('./admin.php');$move_from_list = '1';$move_to_list = '2';// cycle all users on "from" listecho "moving users from list $move_from_list to list $move_to_list - please wait<br>";flush();$rows = mysql_query("select id,email from $utable where list = '$move_from_list';");echo @mysql_num_rows($rows).' users to process<br>';while(list($id,$em)=mysql_fetch_row($rows)){ $row = mysql_query("select id from $utable where list = '$move_to_list' and email like '$em';"); // if not on list move user if(@mysql_num_rows($row)==0) mysql_query("update $utable set list = '$move_to_list' where id = '$id';"); else echo "duplicate email $em<br>";}echo "done!<br>";?>