Create subassembly from Polyline in Civil 3D

To create a subassembly from a polyline object, first, create the desired polyline object in the drawing. Then convert the polyline to a subassembly using the Create Subassembly From Polyline command. Add the new subassembly to an assembly by right-clicking it and clicking Add To Assembly.
Make sure the polyline object is free of drawing errors. If necessary, use the drawing cleanup tools in AutoCAD Map 3D.
Use code set styles to control the visual appearance of subassembly components. You can use existing code set styles or create your own.
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Sir how can i export this subassembly as a pkt file

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