=====How to use a decomposition (boolean function)===== A Decomposition is required if a boolean operation results in more then one model, here for example a subtraction of a cylinder-ring from a plate. Select the compound to be decomposed, here the subtraction. {{:tutorials:how_to:substraction.png?200|}} Click onto “Update” button of the DECOMPOSITION DIALOGUE, start with Index 0 and increase the Index until the part model you wish to use has been decomposed. {{:tutorials:how_to:index_0.png?200|}}{{:tutorials:how_to:index_1.png?200|}}{{:tutorials:how_to:index_2.png?200|}}