# Split surface into smaller ones

**URL:** <https://forum.dynamobim.com/t/split-surface-into-smaller-ones/114367>\
**Category:** Revit\
**Tags:** revit\
**Created:** [April 7, 2026, 4:01pm UTC](https://forum.dynamobim.com/t/split-surface-into-smaller-ones/114367 "2026-04-07T16:01:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![yinodo2737](https://avatars.discourse-cdn.com/v4/letter/y/e8c25b/32.png) [@yinodo2737](https://forum.dynamobim.com/u/yinodo2737)\
**Post date:** [April 7, 2026, 4:01pm UTC](https://forum.dynamobim.com/t/split-surface-into-smaller-ones/114367/1 "2026-04-07T16:01:28Z")

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![image](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/6/5/651f46b53449eabc7def36585d7ee73443869e3c.png)  
hello  
I have a ceiling surface, and I want to divide it into multiple square surfaces using the grid lines (the black lines) shown

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<div class="post-metadata">

**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:** [April 7, 2026, 4:25pm UTC](https://forum.dynamobim.com/t/split-surface-into-smaller-ones/114367/2 "2026-04-07T16:25:09Z")

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`PolySurface.ByJoinedSurfaces` for the U axis surfaces and the V axis surfaces.

`Geometry.Split` to slice the target surface using the U polysurface.

`Geometry.Split` to dice the target surface using the V polysurface.