# Question regarding usage of the "options from\_dataset=" field

**URL:** <https://help.galaxyproject.org/t/question-regarding-usage-of-the-options-from-dataset-field/14239>\
**Category:** usegalaxy.org support\
**Tags:** development-tools\
**Created:** [December 23, 2024, 9:58pm UTC](https://help.galaxyproject.org/t/question-regarding-usage-of-the-options-from-dataset-field/14239 "2024-12-23T21:58:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![george.weingart](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/george.weingart/32/1770_2.png) [@george.weingart](https://help.galaxyproject.org/u/george.weingart)\
**Post date:** [December 23, 2024, 9:58pm UTC](https://help.galaxyproject.org/t/question-regarding-usage-of-the-options-from-dataset-field/14239/1 "2024-12-23T21:58:40Z")

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Hello Forum,  
I have a question regarding the usage of the “options from\_dataset” field.  
Enclosed

 ![Page_1](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/9/999a7a07408f030fc11d6dbd57b7b18d535a1513.png)  
 ![Page_2](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/d/d83d6cc704e61a6c854cec6b6e167aa577af21de.png)  
 ![Page_3](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/3/32d6290f3a11fff3a25e85c0b79d46816b693825.png)  
 ![Page_4](https://us1.discourse-cdn.com/flex020/uploads/galaxy/original/2X/a/a0974ac1efd9675824860559690d3f6c0cef4757.png)

Thanks!  
George Weingart PhD  
Huttenhower Lab  
Harvard School of Public Health

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<div class="post-metadata">

**Author:** ![bjoern.gruening](https://sea2.discourse-cdn.com/flex020/user_avatar/help.galaxyproject.org/bjoern.gruening/32/10_2.png) [@bjoern.gruening](https://help.galaxyproject.org/u/bjoern.gruening)\
**Post date:** [December 28, 2024, 9:00pm UTC](https://help.galaxyproject.org/t/question-regarding-usage-of-the-options-from-dataset-field/14239/2 "2024-12-28T21:00:54Z")

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Hi @george.weingart,

have you seen [tools-iuc/tools/maaslin2 at main · galaxyproject/tools-iuc · GitHub](https://github.com/galaxyproject/tools-iuc/tree/main/tools/maaslin2) … can you maybe add a PR to this tool if you are missing some functionality? It would also ease the review.

In general I think you can do something like that in the command section:

```auto
#if $input_subclass.strip() != ""
--subclass $input_subclass
#else
--subclass NONE
#end if
```