# SubFlows

SubFlow in cosmocloud provides modular approach to build reusable piece of flow. It helps you to build a piece of code once and plug it in existing flow.

## Create SubFlow

* Navigate to **Application Layer -> SubFlows** in your Cosmocloud project.
* Click on **Create SubFlow** button
* Add your SubFlow name as well as add the **Arguments** your SubFlow will receive from the calling Flow (an API or other SubFlow).

## Understanding Arguments

<figure><img src="/files/Px5SAPczMcNI4SLoJDou" alt=""><figcaption></figcaption></figure>

* **Toggle :** This is used to mark if argument is `required` or `optional`
* **Argument key :** argument name to be received
* **Argument type :** It specify what type of value is expected
* **Default :** It specify default value if user didn't enter value. (optional)

## How to use SubFlow

SubFlow in cosmocloud is an isolated component which means  every value that you want to access in SubFlow needs to passed as an argument.

#### Understanding SubFlow node

* To execute this SubFlow in an existing API, you can use `Execute SubFlow` node&#x20;

<figure><img src="/files/ACxWgEcDdL94YOA4R9Iv" alt=""><figcaption></figcaption></figure>

* You need to select the SubFlow which you need to execute and also pass required arguments.

<figure><img src="/files/J1JghaqiByvfc11UFK7l" alt=""><figcaption></figcaption></figure>

* Arguments will be passed in as keys and values. These values are case sensitive so make sure enter correct terms.

<figure><img src="/files/YMb7gVsCbJOLONHuDUrN" alt=""><figcaption></figcaption></figure>


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