Need help creating multiple child records on one visualforce page via a related list button

Hello all,

I've been trying for awhile to create a list button that will allow the creation of multiple child records of the same parent record on one Visualforce page (rather than clicking save and new over and over). I need to pass the parent ID and assign a record type, and I'd prefer that happen without the user having to do anything other than click the button on the related list. My visualforce page works in that if I preview it, I can see each field in a column, and the "add" link is working to add new rows. However, the parent ID isn't getting passed, I can't figure out how to assign the record type ID, and the "x" link to delete a row isn't working.

I've posted on the forum about this multiple times, but have not received many replies.