The theme was developed with this specific permalinks structure and there is no option to adjust these in accordance to your specific needs, however these changes you are seeking could be achieved via custom work. Unfortunately we do not provide our customers with any custom work due to our policy,therefore we do not provide any instructions or files list for implementing customization you are seeking. We only do Support for our products if there are some issues in work, or some elements cause issues, etc.
In case you need to make some customizations you could try to figure this out on your own, which needs some skills in coding and programming.
In case if you believe our theme misses enough custom options to fully meet your needs you could involve/ask for help a third part developer to customize the theme the way you personally like.
Thanks for understanding and sorry for any inconveniences!
This page you mentioned http://cardealer.webtemplatemasters.com/car/ is the archive page, Thank you or your suggestion but the theme was developed with this permalink structure and for now we are not planning to change it since it will involve lots of changes to other theme functions, but we will add it to our TODO list and will update it within future theme updates and improvements. Thank you and have a great day!