This hack helps you to save a lot of time to setup products options.
Just generate products-options-lists and assign them to the products of your choice.
Now you are able to share a single options-list between multiple products.
You had the choice between selected lists for a single product (mostly a new one) or lists to already existing products....
lists -> products
products -> lists
If you change prices or add an other product-option it will affect all products where this list is assigned to.....