Add variables to a workflow in Automator on Mac
Click Variables in the top-left corner of the Automator window, then select a category from the Library.
The variables related to that category are displayed.
Drag the variable you want to use into the workflow.
A Get Value of Variable action is added to the workflow. The value of the variable is passed to the next action.
If the Get Value of Variable action receives text as input from the previous action, the variable is appended to the text.