> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co.md).

# Cohort Operations tool (CO)

### With the Cohort Operations (CO) tool, you can:

* [Upload cohorts for further operations](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/upload-cohorts-to-co.md) from:
  * [Atlas](/working-in-the-sandbox/which-tools-are-available/atlas.md)
  * [Genotype Browser](/working-in-the-sandbox/which-tools-are-available/genotype-browser.md)
  * text files (with FinnGen IDs and columns for `COHORT_SOURCE` and `COHORT_NAME`)
  * Endpoints
* [Combine cohorts](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/combine-cohorts-with-co.md)
* [Operate on Atlas cohorts (data with entries and exit events)](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/modifying-atlas-cohort-with-co.md)
* [Lookup and visualize code and endpoint enrichments in cohorts (CodeWAS)](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/explore-code-and-endpoint-enrichments-with-co.md)
* [Lookup and visualize endpoint overlaps](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/explore-endpoint-overlaps-with-co.md)
* [Examine endpoint overlaps with your control and cases cohorts](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/understanding-phenotypic-overlaps-using-co.md)
* [Launch custom GWAS](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/launch-custom-gwas-with-co.md)
* [Easily export FinnGen IDs](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/export-finngen-ids-using-co.md) for cohorts
  * built with Atlas
  * generated from FinnGen endpoints
  * resulting from other operations available in the tool
  * [Transfer cohorts to TVT](/working-in-the-sandbox/which-tools-are-available/cohort-operations-tool-co/export-finngen-ids-using-co.md)

Check an [Example workflow for survival time/endpoint analysis](/working-in-the-sandbox/general-workflows-for-the-most-common-analyses.md) on how to use CO efficiently with other tools. It is important to check whether your cohorts are up to standard before continuing to GWAS.

See a tutorial video about CO on [FinnGen data users meeting 25th Jan 2022](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-25th-jan-2022) at 16min35sec and [FinnGen data users' meeting 28th June 2022](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-28th-june-2022) at 28min55sec.

See also a [presentation of New FinGen tools and their application to example diseases from User's meeting 28th March 2023 recording ](https://www.finngen.fi/en/members/recordings/finngen-data-users-meeting-28th-march-2023)(at 25min 23sec) including usage of Cohort Operations tool.