Accordion menu using mouseover to open the sub-sections.
Sub-sections displayed in a fixed height list.
One item always open.
This section has a shopping mode of 'Single Add To Cart Button Per Page' so you can select what you want and then add them all in one go to the shopping cart.
These two computers both come with a range of optional extras, which are set up as 'hidden products' in the store. Also, if you click the 'More Info' links, you will open a new page with further details.