# Create Reference Lines from CAD (DWG) Curves (3D Polylines)

**URL:** <https://forum.dynamobim.com/t/create-reference-lines-from-cad-dwg-curves-3d-polylines/107279>\
**Category:** Revit\
**Tags:** revit, dynamo\
**Created:** [January 16, 2025, 3:32pm UTC](https://forum.dynamobim.com/t/create-reference-lines-from-cad-dwg-curves-3d-polylines/107279 "2025-01-16T15:32:13Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [January 17, 2025, 6:00pm UTC](https://forum.dynamobim.com/t/create-reference-lines-from-cad-dwg-curves-3d-polylines/107279/8 "2025-01-17T18:00:43Z")

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> [@Wojty1](#):
>
> Should it be that way?

Yes - this is to prevent creating duplicate instances when authoring graphs. Save the file, clear out any [Element Binding](https://forum.dynamobim.com/t/element-binding-in-revit/31612), and leverage Dynamo Player to circumvent the issue.

> [@Wojty1](#):
>
> A better solution would be to create multiple curves, but I have absolutely no idea how to do that.

This is certainly a better option - and super easy. Check out the Dynamo Primer section on list lacing and then list levels for information on how Dynamo manages for loops: [What's a List | Dynamo](https://primer2.dynamobim.org/5_essential_nodes_and_concepts/5-4_designing-with-lists/1-whats-a-list)

The whole primer is likely worth going through as you’ll learn a bunch of stuff which will smooth over your adoption. Skip the section on Civil 3D if you don’t use Vibil 3D or AutoCAD.

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