Bulk Record Creation (User Defined # of Records)

Can anyone suggest how I can create an unknown number of child records? Sometimes the user might need 10, 50, 200 or any number in that range. I would like the user to have the option to enter this # in a field and click a button to trigger the process. I thought I could use a pipeline loop but I don't see a way to run the loop a number of times based on a field value. 

My goal is to populate the table shown below, with no data, allowing the user to quickly input the data right on this form without adding/opening/editing each individual record. I'm happy to provide more details or take a different approach.

Thanks