1- take a box (or whatever your want to cut ou of the glass) place it over a wineglass at one of the areas you want to be separate. Make the box negative and the wineglass positive. Now group them and you have got one of your wineglass-pieces. Now clone the group and change the box of this second group to intersect. Now you should have the other piece of your wineglass to. There are two important things to remember: 1. Never place any neutral objects in your boolean groups, otherwise you might get unwanted results, like negatives that don't want cut other objects. 2. If you use imported models set them to 'solid when boolean rendering'. You can set that in the little menu that you get when you select the imported object and click on the little 'e'-button.

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