Open PowerPoint and create a new slide
Go to the Insert tab
Select SmartArt
Choose a timeline layout from the Process category
Click OK
Enter your timeline events in the text pane
Add or remove events as needed
Customize the colors, styles, and layout from the SmartArt Design tab
Resize and position the timeline on the slide
Add dates, milestones, and labels
Use text boxes or icons if needed for extra details
Save your presentation