How do I get form to automatically copy/paste a group of text fields?

I have a group of text fields that are in my form. 

I would like the user to be able to select a number in a number field and it automatically paste “x” number of the group of text fields for the user.

I.E   The user states that he has 5 problems.  He goes to the numerical field and chooses the # 5.  I would like my form to automatically paste 5 of my text field groups for him to enter his data.

If this is not achievable then I would like to have a check box below my group of text fields asking “Is there another problem”.  When the user checks the box it automatically pastes another group of text fields for him to enter in his data.