# How can you replace a terrain with another across all sources?

**URL:** <https://discourse.cataclysmdda.org/t/how-can-you-replace-a-terrain-with-another-across-all-sources/27072>\
**Category:** The Toolbox\
**Created:** [September 20, 2021, 8:05pm UTC](https://discourse.cataclysmdda.org/t/how-can-you-replace-a-terrain-with-another-across-all-sources/27072 "2021-09-20T20:05:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Bio](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.cataclysmdda.org/bio/32/6690_2.png) [@Bio](https://discourse.cataclysmdda.org/u/Bio)\
**Post date:** [September 20, 2021, 8:05pm UTC](https://discourse.cataclysmdda.org/t/how-can-you-replace-a-terrain-with-another-across-all-sources/27072/1 "2021-09-20T20:05:43Z")

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so i’m trying to change open\_air tiles on roof tops to sand or some other form of solid matter across all structures so I don’t get any of this stuff:

 ![unsolid](https://us1.discourse-cdn.com/flex016/uploads/cataclysmdda/original/2X/5/50eb00c8ede970cf976b96dd743d6ee5faf35da9.png)  
However i’m trying to figure out I would fill in those areas with solid traversable matter like sand. Is there any way I can transform that terrain at the source?  
For that matter how I change any other type of terrain to act like another, such as transforming all sidewalks to become “solid\_earth”