From Version 6.5 you can bundle products together and create custom packages to offer your customers. The software will take care of the package prices, weight and stock so all you need to do is choose the products you want to have in the package and start offering them on your store. The products in the bundles will still be available for purchase separately but this feature allows the store owner to combine items to make a custom set of products. Discounts can be set on the bundle which wouldn't have to be set on the individual products.
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Go to your product admin page and set up a new product which will be the bundled item.
You won't need to add true details to the price or weight field as that will be determined by the products added to the bundle.
Now list the products and click on the "Pak" (Package) button
Check the products which should be included in the bundle you are setting up
Save that and you are all done. You may want to check the main bundle product has the correct values for weight and price but you should now be able to test it on your store by adding the bundle to cart and making sure the items appear listed as you need them