Well, this is as simple as setting up your form correctly in EP-Dev Whois:
Here is an example for using orderwizard (orderwiz.php) for what the available domains template would look like in EP-Dev Whois:
Code:
<form action="/order/orderwiz.php" method="GET">
[repeat]
<input type="checkbox" name="domains[]" value="[[domain]]|[[ext]]"> [[domain]].[[ext]]
[/repeat]
<input type="hidden" name="submit_package" value="domain">
<input type="hidden" name="coupon_code" value="">
<input type="hidden" name="submit_domain" value="register">
<input type="submit" name="submit">
</form>
I recommend using orderwizard. However, you can achieve the same results with MB's vortech form by changing domains[] to m_domains[] in the code above while adding in the other variables as hidden (such as "aid", "c_code", etc... just as I did with "submit_package", "coupon_code", and "submit_domain").