# How to use Call to Action / Sub processes ?

**URL:** <https://community.ofelia.com/t/how-to-use-call-to-action-sub-processes/3905>\
**Category:** Q&A\
**Created:** [25 October 2013 21:51 UTC](https://community.ofelia.com/t/how-to-use-call-to-action-sub-processes/3905 "2013-10-25T21:51:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/community_bonitasoft/original/2X/6/6b7b18c0478f2645369e82e009b65e3b97f2cc12.svg) [@system](https://community.ofelia.com/u/system)\
**Post date:** [25 October 2013 21:51 UTC](https://community.ofelia.com/t/how-to-use-call-to-action-sub-processes/3905/1 "2013-10-25T21:51:26Z")

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I need to call other process(es) from my main process.

How do I do that in Bonita BPM ?

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**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/community_bonitasoft/original/2X/6/6b7b18c0478f2645369e82e009b65e3b97f2cc12.svg) [@system](https://community.ofelia.com/u/system)\
**Post date:** [25 October 2013 21:51 UTC](https://community.ofelia.com/t/how-to-use-call-to-action-sub-processes/3905/2 "2013-10-25T21:51:43Z")

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On Community blog, there is a very good example of a process calling calling for another one: the Trello Application Example.

At the beginning, the process check if some information are available, and if not, or if the user would like to use new credentials for Trello API, an other process will be called. You can find resources here:

- [Trello Application Example, part 1](http://community.ofelia.com/blog/trello-application-example-%E2%80%93-part-1)
- [Trello Applciation Example, part 2](http://community.ofelia.com/blog/trello-application-example-%E2%80%93-part-2)
- [Sources and .bos on GitHub](https://github.com/Bonitasoft-Community/Trello-connector)