How do i set pre selected fields

I'll try my best to explain, for example i want to have a list such as lets say phones, Samsung, iPhone, LG, HTC, and i want to associate different locations when a phone is selected such as A, B, C, D, E. So if iPhone is selected i want an automated list to appear showing different locations such as lets say A, D, E or if HTC is select B, C will automatically appear and someone can select B or C. 

You can use conditional logic to show fields based on options selected or entries in the form:

https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

You can also hide/show multiple fields with a single condition:

https://www.jotform.com/help/196-Hide-or-Show-Multiple-Fields-at-Once