Problem:

Let say customer needs to collect Device information from users and for this they may need to first how many devices they have based on selection need to collect additional information for each devices. 

In the example, first questions could be "How many devices do you have?" if the user selects two then we need ask following questions twice for each devices:

• Type of device mobile or laptop
• Model of the device 
• OS 

If the select three then same questions should be repeated 3 times. 

Suggestion:

Provide an options For Each based on number field selected.