Add dynamic questions in Google forms

I am using google forms to punch orders in my Google Sheets.

Although I am facing a challenge as the number of products is variable.

For example

Question 1: Item Name 
Question 2: Quantity

I want the responder to add as many items and quantities as they want.

Is it possible to do the same with core features or appscripts? If not possible with google forms, is there any other form app to do the same?