PHP work for configurator(repost)

My website, [login to view URL] has a configurator on it which can be viewed at [login to view URL] It currently has four configurators for the four computers which I sell (rogue, espionage, shadow, and enigma). I would like to add laptops to the already existing configurators. I would also like the ability to add/remove computers with ease. Lastly, I want to be able to add or remove parts from each configurator with ease. For example, add/remove the category "motherboard". I want the existing functionality of the site, ESPECIALLY front end, to remain the same. I don't want the site to look any different to the front end except for the addition of two new laptops. I want the new computers to exist in their OWN system seperate from the other four computers. If the computers breaks down, for example, I don't want this to affect the laptops. Thanks, happy bidding! ## Deliverables a FULL BACKUP must be created before ANY AND ALL work is done on this site. If anything should go wrong, coder MUST be able to restore website to the condition it was in before any modification was made. Periodic backups must be performed.