s1.Enter a number in number field of a form S2. Click on Add Button
S3. Those many rows with some fields in the rows should be generated.
Subject: Do you need new fields?
If you want separate fields you need to look at using DXL. Rocky Oliver had a sample DB you could look at here → http://www.lotusgeek.com/LotusGeek/LotusGeekBlog.nsf/d6plinks/ROLR-77MMZW
Depending on how the user needs to input the data into the fields, you may be able to use 1 multi-value field and present them with form in a message box to enter in each “row” of data.