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I like to hide some of them in the registration page. So when a new user is registering for our community they should only see 6 of 8 total profile types.
How can i hide them? Which file i need to customize?
Well, this is cant be configured in backend, but you can hack the code for this, open this file components/com_community/templates/register.profiletype.php, find this code :
foreach($profileTypes as $profile)
{
and add the condition to hide the profile type as you want :
foreach($profileTypes as $profile)
{
if($profile->id==YOURID_PROFILETYPE_1 || $profile->id==YOURID_PROFILETYPE_2) continue;