How To Select Member Groups At Registration

[testboard]

No, I am referring to permissions. Users are members of both groups under the system you are running.

OK, now I definitely do understand. Member of both groups but "yes" over-rides "no" as in being a member of group giving permissions mean you have those even if another group does not.

You are creating a profile field to check upon activation.

I understand now & I have managed to create profile fields which appear to work as I want (Completed at activation, not editable in the users profile by the user).

At activated, you sort into your usergroups.

Not sure about where "activated" / "activation" is - presumeably once an admin has moderated a new user so they are allowed to post.
I'm going to have a look through the code now to see if I can find a hook at some point.

If so, I think what I need to do is create a plugin that takes the contents of the profile field & adds the corresponding groups to "membergroupids" as appropriate.

Am I on the right track now?
Thanks for all your help so far.

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It seems that the best place to add the code to set "membergroupids" is in:
/admincp/user.php?do=domoderated
at about this point in the code:
$userdata->set('usergroupid', 2);

However I see no hooks that I can use for a plugin.
Should I just add the code to user.php or am I missing what you mean by "activation"?
I will have a look through the ACP to see if there are any "activation" options in there.

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SOLUTION:

1) In ACP/User Profile Fields/Add New User Profile Field
Add the new field by completing the form.

2) In ACP/Plugins & Products/Add New Plugin
Add a new plugin. This is the code I used:
$tradegroup = $db->query_first('SELECT field7 FROM userfield WHERE userid=\''.$userinfo['userid'].'\'');
$groupnum = $db->query_first('SELECT usergroupid FROM usergroup WHERE title=\''.$tradegroup['field7'].'\'');
$userdata->set('membergroupids', $groupnum);

Change mentions of field7 to whatever the field number is that you set up in step 1.
The hook is: register_activate_process

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NOTES:
In case someone has searched & found the above soloution, this is still not perfect:

1) The dropdown list from step 1 is not auto-populated with additional member groups that may be created in the future.
2) I don't think there will ever be entries in "membergroupids" but if there is then the above code will overwrite them rather than add to them.

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Finally, thanks for all your help, pointers & explanations "Dismounted".

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Spoke too soon, the hook is wrong, users can post before they are moderated.
I think I have now officially lost the will to live with this.

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--------------- Added [DATE]1214536511[/DATE] at [TIME]1214536511[/TIME] ---------------

Changed the code slightly & added to admincp/user.php in do="domoderate":

$tradegroup = $db->query_first('SELECT field7 FROM userfield WHERE userid=\''.$user['userid'].'\'');
$groupnum = $db->query_first('SELECT usergroupid FROM usergroup WHERE title=\''.$tradegroup['field7'].'\'');
$userdata->set('membergroupids', $groupnum);

All working now, although this is not a good way of doing it as vbulletin upgrades may fail as I've edited the code directly rather than using a hook with plugin code.