# Sum area values from shared parameters and put into a room tag parameter

**URL:** <https://forum.dynamobim.com/t/sum-area-values-from-shared-parameters-and-put-into-a-room-tag-parameter/82841>\
**Category:** Revit\
**Tags:** revit, dynamo, rooms\
**Created:** [November 7, 2022, 9:09pm UTC](https://forum.dynamobim.com/t/sum-area-values-from-shared-parameters-and-put-into-a-room-tag-parameter/82841 "2022-11-07T21:09:26Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mic6PR6M](https://avatars.discourse-cdn.com/v4/letter/m/35a633/32.png) [@mic6PR6M](https://forum.dynamobim.com/u/mic6PR6M)\
**Post date:** [November 7, 2022, 9:09pm UTC](https://forum.dynamobim.com/t/sum-area-values-from-shared-parameters-and-put-into-a-room-tag-parameter/82841/1 "2022-11-07T21:09:26Z")

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I have a project with appx 100 rooms, where I need to create floor plans with room tags, showing the floor, wall, and ceiling areas (m2).  
The best way I found is to use the Revit roombook extension, where I can extract all the relevant surface areas and put them in schedules and into shared parameters of quantity id families.

Here comes the challenge:  
How can I combine the separate wall surface areas, and put that value into a room tag parameter? The ceiling surface area should just be moved into a room tag parameter. Can you help me with the script?

So far I have used Dynamo once, but I believe in this case there is no other way to achieve this?  
If you have a better suggestion of how to extract wall and ceiling surface areas of rooms (not just cube-shaped rooms) and put them into room tag parameters (so it can be seen on a plan) please let me know. 🙂

(The ceilings for these rooms are not always horizontal. (curved, sloping, etc)