List Page

I have a a list page with the master order details listed above the list page. I want to be able to have the end user click on inline add and than have the saveall button when clicked redirect to the next page where I will need to collect more information. Can someone tell me what code needs to be implemented and where to add this code please. I have added a

header("Location: test.php");

exit();
But I get an error saying error occurred and there is a link that shows the correct page. I have tried it another way and got an error saying the header has already been posted and cannot do it again.
All I want to be able to do is when the end user clicks saveall from inline add is to save the record and move to the next page. I have 9 steps and 7 out of the 8 work as they are normal add pages but 2 pages have to be list as they can have many records.
Thanks,
Steve