add the option to provide a variable name for the snippet

faqs/galaxy/workflows_variables.md

@@ -4,10 +4,34 @@ area: workflows
 box_type: tip
 layout: faq
 contributors: [delphine-l]
+optional_parameters:
+  var_name: Name of the workflow Variable
+examples:
+  Use a Species Name:
+    var_name: "Species Name"
 ---
 
 Workflow text inputs can be used as parameters for tools but also in the workflow editor for renaming files. 
 
+{% if include.var_name %}
+# 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 with  `{{ include.var_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 the variable used above, proceed with the following steps: 
+1. Open the workflow editor
+2. Click on the tool in the workflow. This will open the tool configuration on the right-hand side of the screen with all details, like parameters etc.
+3. Scroll down and click on **Configure Output**
+4. In **Rename Dataset**, enter the new dataset name: `Tool run on ${{{ include.var_name }}}`. `Species Name` must match the workflow variable name you created before.
+
+{% else %}
+
 # Create a workflow variable
 
 1. Open the workflow editor
@@ -22,4 +46,6 @@ To use the workflow parameter for renaming a dataset, use the syntax: `${Paramet
 1. Open the workflow editor
 2. Click on the tool in the workflow. This will open the tool configuration on the right-hand side of the screen with all details, like parameters etc.
 3. Scroll down and click on **Configure Output**
-4. In **Rename Dataset**, enter the new dataset name: `Tool run on ${Species Name}`. `Species Name` must match the workflow variable name you created before.
+4. In **Rename Dataset**, enter the new dataset name: `Tool run on ${Species Name}`. `Species Name` must match the workflow variable name you created before.
+
+{% endif %}