create multiple child records on saving a parent record

If you do not find a better solution and don't have anyone to write javascript for you, then there is an add on product from Juiced called Triggers which can be used.  It's at the bottom of the page.
http://www.juicedtech.com/add-ons


I also know how to do this with a Webhook, but not for the aspect of a variable number of records to be created.  I had to do that myself recently, and while my solution worked, it was not very elegant.

What is the range of the number of child records which might need to be created.