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If you need to delete any basic parts creating 3D object, switch the object selection to select the single elements or to select the branches of Boolean tree. In this example, the hole, grooves and a chamfer are selected as single objects.

You can also right-click a solid and then to select the modification of Boolean tree from its scheme. The most convenient method, if you are between commands – not inside any command, is to press and hold Ctrl key and move cursor over solid’s elements. This causes detection of single elements of a Boolean tree. Select element (or elements), finish selection by right-click and then choose command to edit (transformation, delete…).
