# Create the slab through dynamo

**URL:** <https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035>\
**Category:** Revit\
**Tags:** revit, dynamo\
**Created:** [January 3, 2020, 3:09am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035 "2020-01-03T03:09:35Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![viclalala](https://avatars.discourse-cdn.com/v4/letter/v/7cd45c/32.png) [@viclalala](https://forum.dynamobim.com/u/viclalala)\
**Post date:** [January 3, 2020, 3:09am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035/1 "2020-01-03T03:09:35Z")

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![Capture](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/4/0/40373c8a817fcadeadb8371d52540511a7b8d755.jpeg)  
Hi I’m a student and dynamo beginner.

I’m trying to extract the curves from cad file,and use it to build the slabs(the blue mark)  
How can I complete it?

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**Author:** ![jostein\_olsen](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jostein_olsen/32/8570_2.png) [@jostein\_olsen](https://forum.dynamobim.com/u/jostein_olsen)\
**Post date:** [January 3, 2020, 8:57am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035/2 "2020-01-03T08:57:05Z")

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Hi!  
first of all, can you show us your curve output and what your yellow warning one the floor node is showing?

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**Author:** ![Mepdot](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/mepdot/32/106281_2.png) [@Mepdot](https://forum.dynamobim.com/u/Mepdot)\
**Post date:** [January 3, 2020, 11:30am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035/3 "2020-01-03T11:30:47Z")

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@viclalala, @jostein_olsen

I created a similar example below which may help you.

 ![Floor.ByOutlineTypeAndLevel Capture](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/2/8/289e574773bbbb73e41b682688379dfc3f207086.png)

Sample files are below  
[CAD Drawing.dwg](https://forum.dynamobim.com/uploads/short-url/1X4uZBW8vGeu20JZ1JT8In3m17L.dwg) (31.8 KB) [Though CAD link Floor.ByOutlineTypeAndLevel.dyn](https://forum.dynamobim.com/uploads/short-url/cuolpiaDHHsEmOIE8P350VuwV9F.dyn) (47.1 KB)

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<div class="post-metadata">

**Author:** ![viclalala](https://avatars.discourse-cdn.com/v4/letter/v/7cd45c/32.png) [@viclalala](https://forum.dynamobim.com/u/viclalala)\
**Post date:** [January 5, 2020, 7:31am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035/4 "2020-01-05T07:31:06Z")

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![Capture](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/1/8/1898eb3113a99bd24850bca997cb37415e91b44a.png)  
Hi thanks for your help.  
The file you provided which has some problem, I couldn’t open dyn file after downloaded.  
So I typed it again but it seems that some problems inside.  
It must be the “List.Flatten”.  
Can you explain it for me?

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<div class="post-metadata">

**Author:** ![viclalala](https://avatars.discourse-cdn.com/v4/letter/v/7cd45c/32.png) [@viclalala](https://forum.dynamobim.com/u/viclalala)\
**Post date:** [January 5, 2020, 7:32am UTC](https://forum.dynamobim.com/t/create-the-slab-through-dynamo/45035/5 "2020-01-05T07:32:19Z")

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hi I will post it tomorrow. thanks