Create a timeline in PowerPoint - Microsoft Support
https://support.microsoft.com/en-us/office/create-a-timeline-in-powerpoint-d1bd35a0-bfa7-428b-ba3c-c8f5b6050791
WEBClick a shape in the timeline. On the SmartArt Design tab, do one of the following: To add an earlier date, click Add Shape, and then click Add Shape Before. To add a later date, click Add Shape, and then click Add Shape After. In the new date box, type the date that you want. Move a date in your timeline.
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