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Pick Part First Limits the selectable geometry to a single component. To select different geometry on the first component, click First Selection, and then reselect. Second Selection (Transitional Face) Selects the second component. First Selection (Moving Face) Selects the first component. Selections Selects geometry on two components to constrain together.
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Access Ribbon: Assemble tab Relationships panel Constrain, and then click the Transitional tab. A transitional constraint maintains contact between the faces as you slide the component along open degrees of freedom. A transitional constraint specifies the intended relationship between (typically) a cylindrical part face and a contiguous set of faces on another part, such as a cam in a slot.
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