Add new record based on existing record ie saveas

I have two models - Rotas and Lines.
Rotas have many lines and Lines belongs to Rotas. I am trying to
create a function that will take an existing record (a rota with n
lines) and save it as a new rota complete with the associated lines.

I can create a new rota and add new lines, I can create a new rota
based on an existing one but with no lines.

I am aware of unsetting the id to force an add but cannot seem to
bring the associated lines with it. I have scoured the forums and have
been bashing this one for 2 weeks now - can anyone give me a clue?

The first part of the function creates a new rota record but the
second part creates nothing (trying to savas existing lines).

I have also tried getLastInsertID() but cannot seem to get a value
from this.

I think my basic principle is wrong!

function copyLast($id = null) {

$this->Rota->recursive = 2;
unset( $this->data['Rota']['id'] );

if ($this->Rota->save($this->data)) {

if (!empty($this->data)) {
$this->data = $this->Rota->read(null, $rota_id);
$tempData = $this->data['Line'];

foreach($tempData as $id => $value)
{
unset( $this->data['Line'][$id]['id'] );
unset( $this->data['Line'][$id]['rota_id'] );
unset( $this->data['Line'][$id]['Rota']['id'] );
$this->Rota->Line->create();
$this->Rota->Line->save($this->data);
}
}
}

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