Add tasks to a project timeline in Project Online - Microsoft Support
https://support.microsoft.com/en-us/office/add-tasks-to-a-project-timeline-in-project-online-285b8052-ac5f-4936-9207-dcce549da4ba
WEBClick anywhere on the timeline, then on the Tasks tab, in the Tasks group, click Add to Timeline. Tip: You can change the appearance of the timeline to use different colors, fonts, dates, and callouts. To add another timeline, click the current timeline, and then click Add in the Timeline Bar group on the Timeline tab.
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