To make a workbook available in Tableau Online, you need to publish it from Tableau Desktop to Tableau Online. You can do this by selecting Publish Workbook from the Server menu, signing in to your Tableau Online account, choosing a project and a name for your workbook, and clicking Publish. This will upload your workbook and its data sources to Tableau Online, where you can view, edit, and share it with others. References:
* Tableau Certified Data Analyst Exam Prep Guide, page 10, section "Publishing and Scheduling Data Refreshes"
* Tableau Help: Publish a Workbook