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The Group tab shows a list of all List VOIs with a selection box.
Initially, all VOIs are selected. The selection can be changed by dragging over the selection boxes and using CTRL+Click to selectively enable/disable VOIs. Additonally, CTRL+A or Select All selects all entries, and the Inverse button reverts the selection.
The buttons to the right act on the current selection. For instance, the + button sets the contours of all selected VOIs to positive.
VOI Union
The Union button serves for creating a new VOI from the selected ones. The resulting VOI includes the contours of all source VOIs, whereby the +/- property of these contours is maintained. This function is useful for creating a VOI from sub-structures, but also to subtract a smaller VOI from a larger one.
VOI Intersection
The Intersection button outlines the intersection volume of two VOIs and adds it as a new VOI to the List. Two VOIs have to be selected in the VOI list in the Group tab.