# FEM API - Construction Stages

**URL:** <https://femdesign.discourse.group/t/fem-api-construction-stages/164>\
**Category:** General Discussion\
**Tags:** waiting\
**Created:** [7 March 2024 11:51 UTC](https://femdesign.discourse.group/t/fem-api-construction-stages/164 "2024-03-07T11:51:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Pomer](https://avatars.discourse-cdn.com/v4/letter/p/977dab/32.png) [@Pomer](https://femdesign.discourse.group/u/Pomer)\
**Post date:** [7 March 2024 11:51 UTC](https://femdesign.discourse.group/t/fem-api-construction-stages/164/1 "2024-03-07T11:51:17Z")

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I am trying to add construction stages to my FEM design model using grasshopper. I tried adding them like so:

 ![image](https://europe1.discourse-cdn.com/flex017/uploads/femdesign_api/original/1X/6efc035f095cd3362dcfaae9d8c00d8eb5701d48.png)

But when it runs in FEM only the last construction stage has any elements in it:

Any ideas what I am doing wrong? Basically what I am trying to do is evaluate my concrete slab with different scenarios with each construction removing a different anchor.

Thanks  
Jack

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**Author:** ![MarcoPelle](https://dub1.discourse-cdn.com/flex017/user_avatar/femdesign.discourse.group/marcopelle/32/6_2.png) [@MarcoPelle](https://femdesign.discourse.group/u/MarcoPelle)\
**Post date:** [12 March 2024 09:29 UTC](https://femdesign.discourse.group/t/fem-api-construction-stages/164/2 "2024-03-12T09:29:31Z")

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Hi @Pomer

As I have replied earlier in the email, it is currently possible to only “add” objects through the API.

We will try to add the possibility to remove elements in the next release 🙂

> <https://github.com/strusoft/femdesign-api/issues/970>
>
> FD22 allows to remove object with construction stages.
> Update the API to perfor…m such action
> 
> https://femdesign.discourse.group/t/fem-api-construction-stages/164