Creation of FAQ for using workflow variables to rename outputs

faqs/galaxy/workflows_variables.md

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+---
+title: Rename outputs in a workflow using workflow variables
+area: workflows
+box_type: tip
+layout: faq
+contributors: [delphine-l]
+---
+
+Workflow text inputs can be used as parameters for tools but also in the workflow editor for renaming files. 
+
+# Create a workflow variable
+
+1. Open the workflow editor
+2. Click on **Inputs** in the toolbar on the left
+3. Click on **Simple inputs used for Workflow logic**
+4. Click on the created input box in the workflow editor
+5. Label your input. Example: `Species Name`
+
+# Use a workflow variable to rename a dataset
+
+To use the workflow parameter for renaming a dataset, use the syntax: `${Parameter Name}`. For example, to rename a dataset using my species name: 
+1. Open the workflow editor
+2. Click on the tool in the workflow to get the details of the tool on the right-hand side of the screen
+3. Scroll down and click on **Configure Output**
+4. In **Rename Dataset**, enter the new dataset name: `Tool run on ${Species Name}`