When you add a combo to your cart by clicking the "Buy" button, the combo will show up in your cart as a single product. However, you can convert it to the list of parts that make up the combo by pressing the "Split Apart" button. You can then customise the parts list by removing unwanted parts (change the number in the quantity box and press "Buy") or by adding other parts from the site by clicking their "Buy" buttons.
Note that some combos can't be split - they have been priced to sell as a combo only, and won't be sold for the same price individually. If you edit your order in the Member Area and remove or change the quantity of a part that was part of such a combo, their pricing will revert to the normal non-discounted list price of the individual parts.
If you plan to buy 2 or more system combos at once, please place a separate order for each one - this way their parts do not become mixed up!
Please note that system combos take 1-3 days to assemble and test - their "in stock" status only means we have the parts to build them "in stock".