Open PowerPoint and select a blank slide or a slide layout with content placeholders
Go to the Insert tab
Click SmartArt
Select Process from the SmartArt categories
Choose a timeline-style graphic such as Basic Timeline or Accent Process
Click OK
Enter your dates, milestones, or events in the text pane
Add more timeline points by pressing Enter in the text pane
Use the SmartArt Design tab to change colors and styles
Use the SmartArt Design tab to add shapes if needed
Resize and position the timeline on the slide
Use text boxes and shapes manually if you want a custom timeline
Insert a line or arrow shape for the main timeline
Add circles, icons, or markers for key dates
Add text boxes above or below each marker for event details
Align all elements evenly using the Arrange tools
Group the timeline elements to keep them together
Save the presentation