It is important that you never delete a task that has a baseline as this will cause negative variance without a way to determine why. Instead, you should cancel or inactivate the unneeded task.
If you have Project Professional, you can inactivate a task that is no longer needed in the project with a click of a button. However, if you have Project Standard, you will need to follow this tutorial to inactivate a task.
- Navigate to the Task Ribbon ->View Group -> Gantt Chart
- Click the Select All in the top left corner of the table and select the Work table
- For the task that you want to inactivate, update the Remaining Hours column to 0h (hours)
Note: This will update the Gantt bar to a Milestone symbol
- Double-click the Milestone symbol on the Gantt chart to change the style (we want to differentiate between a milestone and a cancelled task)
- In the Format Bar dialog box, make sure the Bar Shape tab is active. Update the Start shape to another symbol and click the OK button. (I chose the circle)
- Highlight the entire row of the task. On the Task ribbon, expand the Font options, by clicking the arrow on the bottom left of the Font group.
- In the Font dialog box, check the Strikethrough checkbox, update the Color to gray 35%, and click the OK button.
- On the Task Ribbon, Properties Group, click on the Notes icon.
- Add a Note with the date and explanation of why the task was inactivated and click OK.