Master-detail Form

Dear all...

I am a beginner in building drupal form.
and seeking, is there another subform module?
currently i found the "independent subform" such previewed in http://www.tcao.com/drupal/ .
wich is every subform has its own submit_button.

But we need is: A subform in a form, that each child dependent to that parent.
these will have no any submit button.

in other word, user may create some additional fields-set (form-item) at runtime

That form may look like:
----------------------------------------------------------------------
Employee Full Name :
[______________________]

Address :
[______________________]

Childrens :
Name: Age: Gender:                      [Add child] <-- add subform button. may via javascript.
[______________________] [______] (*)Male ( )Female
[______________________] [______] (*)Male ( )Female
[______________________] [______] (*)Male ( )Female

[Send form] <-- main and only one submit button
----------------------------------------------------------------------
Is there a module accomodates it? Hmmm,,
I am prying that somebody will help me as soon,,
A simple PHP trick i will love it; It not yet solved.

I am creating any form with CCK. but confused while build one with this situation.

Last year, I've implement with javascript like:

var subFormz = 3;
function addForm() {
  subForms += 1;
  var sf = document.getElementById('subForms');
  sf.innerHTML = sf.innerHTML + '<div style="display:block"><input type="text" name="names['+subforms+']" value="" size=60>&nbsp; 
<input type="text" name="ages['+subforms+']" value="" size="5">&nbsp; 
<input type="radio" name="gender['+subforms+']" value="0"  checked="checked">Male &nbsp;
<input type="radio" name="gender['+subforms+']" value="1" >Female </div>';

Okey thanks you reading.