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Example: Positioning a part by mating faces
In this example, you will position the red part so its yellow face is mated with the yellow face on the blue cube.
1. Click Structure and then, in the Part & Assembly group, click the arrow next to Position.
2. Click Mate as the type of the positioning operation. The Position dialog box opens with Mate Align selected in the Methods section.
3. Select the yellow face on the red part (on the right). This is the face to move.
4. Select the yellow face on the blue cube. This is the fixed face.
5. Click to complete the operation.
The two parts should look similar to this: