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I desinged a part, but I did it adding pads and other different shapes. I am not sure that whether my whole body is only one solid body or not ?
For example NX has unite command , I wonder what CATIA has instead of this ?
Look in the tree to verify if you have more than one solids:
Solids are found in the Body branches of the tree, and most of the time there is only one body - the Part Body. If you expand the Part Body (select the gray sphere with the + sign), you will see a list of all the features like Pads and Pockets.
If you have two or more solids in the CATPart file, you will see some extra Bodies in your tree. But make sure you expand these bodies, because they might be empty. If you do have extra Bodies containing solid features, then you do have more than one solid.