If I'm understanding you correctly, this will have to be hand coded.
I see your queryobj and rsobj includes are too low on the page... move those up.
Then you can manually add code to the first multiple insert code to make it do two inserts like:
<?php
if (isset($_POST["btnAdduser"]) || isset($_POST["btnAdduser_x"])) { // updated manually
$MultipleInsertConnection = $connEGM_i;
$MultipleInsertTable = "users";
$MultipleInsertRedirect = "2-users_MultiInsert.php?ins=success";
$MultipleInsertCheck = "fmEmail";
$MultipleInsertIdentifier = 'wamultiinsert_1';
for ($mi=0; $mi<sizeof($_POST[$MultipleInsertIdentifier]); $mi++) {
$MultipleInsertCount = $_POST[$MultipleInsertIdentifier][$mi];
if (($MultipleInsertCheck == "" || (isset($_POST[$MultipleInsertCheck.'_'.$MultipleInsertCount]) && $_POST[$MultipleInsertCheck.'_'.$MultipleInsertCount]!=""))) {
$InsertQuery = new WA_MySQLi_Query($MultipleInsertConnection);
$InsertQuery->Action = "insert";
$InsertQuery->Table = $MultipleInsertTable;
$InsertQuery->bindColumn("UserEmail", "s", "".((isset($_POST["fmEmail"."_".$MultipleInsertCount]))?$_POST["fmEmail"."_".$MultipleInsertCount]:"") ."", "WA_IGNORE");
$InsertQuery->bindColumn("UserPassword", "s", "".((isset($_POST["pwd"."_".$MultipleInsertCount]))?$_POST["pwd"."_".$MultipleInsertCount]:"") ."", "WA_IGNORE");
$InsertQuery->bindColumn("UserFirstName", "s", "".((isset($_POST["firstname"."_".$MultipleInsertCount]))?$_POST["firstname"."_".$MultipleInsertCount]:"") ."", "WA_IGNORE");
$InsertQuery->bindColumn("UserLastName", "s", "".((isset($_POST["surname"."_".$MultipleInsertCount]))?$_POST["surname"."_".$MultipleInsertCount]:"") ."", "WA_IGNORE");
$InsertQuery->bindColumn("UserEmailVerified", "i", "1", "WA_IGNORE");
$InsertQuery->execute();
$InsertQuery2 = new WA_MySQLi_Query($MultipleInsertConnection);
$InsertQuery2->Action = "insert";
$InsertQuery2->Table = "site_members";
$InsertQuery2->bindColumn("sm_site_id", "i", "".$InsertQuery->InsertID ."", "WA_DEFAULT");
$InsertQuery2->bindColumn("sm_site_user", "i", "".$_SESSION['SiteID'] ."", "WA_DEFAULT");
$InsertQuery2->bindColumn("sm_userlevel", "i", "2", "WA_DEFAULT");
$InsertQuery2->execute();
}
}
if ($MultipleInsertRedirect) {
if (function_exists("rel2abs")) $MultipleInsertRedirect = rel2abs($MultipleInsertRedirect,dirname(__FILE__));
header("location: " . $MultipleInsertRedirect);
}
}
?>
Then delete the second multiple insert entirely.