# Um-createbc documentation

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611>\
**Category:** Unified Model\
**Tags:** ARCHER2, Nesting-Suite\
**Created:** [14 January 2025 14:52 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611 "2025-01-14T14:52:07Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sebsteinig](https://avatars.discourse-cdn.com/v4/letter/s/898d66/32.png) [@sebsteinig](https://cms-helpdesk.ncas.ac.uk/u/sebsteinig)\
**Post date:** [14 January 2025 14:52 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611/1 "2025-01-14T14:52:07Z")

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Dear CMS Team,

I am trying to set up a suite to create UM ancillary files with the `um-createbc.exe` utility (`$UMDIR/vn10.7/cce/utilities/um-createbc.exe` on ARCHER2). This is for example done in the nesting suites, but I have a slightly different use case for creating global ancillaries for paleo simulations.

I was wondering whether there is any documentation available on how the input namelist for the `um-createbc.exe` utility has to be formatted? I could not find any information in the Helpdesk.

Thank you very much for your help!

Seb

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**Author:** ![RosalynHatcher](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/rosalynhatcher/32/11_2.png) [@RosalynHatcher](https://cms-helpdesk.ncas.ac.uk/u/RosalynHatcher)\
**Post date:** [14 January 2025 15:17 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611/2 "2025-01-14T15:17:58Z")

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Hi Seb,

UM Documentation paper F61 covers CreateBC.  
You can find it on MOSRS here: [https://code.metoffice.gov.uk/doc/um/vn13.7/umdp.html](https://code.metoffice.gov.uk/doc/um/vn13.7/umdp.html)

Regards,  
Ros.

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<div class="post-metadata">

**Author:** ![sebsteinig](https://avatars.discourse-cdn.com/v4/letter/s/898d66/32.png) [@sebsteinig](https://cms-helpdesk.ncas.ac.uk/u/sebsteinig)\
**Post date:** [14 January 2025 15:58 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611/3 "2025-01-14T15:58:23Z")

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Hey Ros,

Thank you so much for the quick answer! The paper is perfect 🙂

Best,  
Seb

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**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/cms_support/original/1X/1fd2411499ffcbc299fe756cd5cdf26e44956558.png) [@system](https://cms-helpdesk.ncas.ac.uk/u/system)\
**Post date:** [15 January 2025 15:58 UTC](https://cms-helpdesk.ncas.ac.uk/t/um-createbc-documentation/1611/4 "2025-01-15T15:58:26Z")

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