This post will guide you how to add a single data point in an existing line char in excel. How do I add a single point to a graph that already has a line chart in Excel 2013/2016.
Assuming that you have a line chart in excel, and the product cost is on the y-axis, and the product is in the x-axis. And if you want to add a single data point appear on that line chart based on a number that you typed into a value into one cell in another column. You can refer to the below steps:
1# type one data point value in one cell in a new column, such as Cell C2.
2# Right click on the existing line chart, and click Select Data…from the drop-down list. And the “Select Data Source” window will appear.
3# Click “Add” button in the Legend Entries section.
4# enter one Series name in the Series name text box, such as: single data point, then choose the whole column including that single data point value (Cell C2). Click OK button.
5# you will see that the specified data point has been added on the existing line chart.