Reusable components are blocks of actions that repeat in multiple tests Instead of creating them again and again you want to create a reusable component and add it to your tests again and again.
Creating reusable component:
Under "Components" choose "Create Component". Very similar to they way that you edit a test, create your flow, add and edit actions. Once completed name your component on the top and save it.
Adding reusable component:
Under the test steps choose the screen after which you want to add the component. click "Add Component" and choose the component from the modal.
Once confirmed, all the additional screens and actions will be added.
Note that the screens were added as is. The component is not linked to the tests to changes to the component will not update the tests. For that you will need to use auto-maintenance.