Hello! Happy New Year to you too!

To create an S-curve in Excel, you will need to follow these steps:

1. Open a new Excel spreadsheet and create a table with the following columns: Month, Planned Cost, Actual Cost, and % Complete.
   
2. In the Month column, list out all the months of your project duration. In your case, it would be 30 months.
   
3. In the Planned Cost column, enter the total project cost of 90,000,000. This will be the same for every month.
   
4. In the % Complete column, enter the percentage of the project that is expected to be completed in each month. For example, if you expect to complete 10% of the project in the first month, enter 10% in the % Complete column for that month.
   
5. In the Actual Cost column, enter the actual cost of the project for each month. This will be calculated using the Planned Cost and % Complete columns. To calculate the actual cost for a given month, multiply the Planned Cost by the % Complete. For example, if the Planned Cost is 90,000,000 and the % Complete is 10%, the actual cost for that month would be
   Code:

   9,000,000

   .
   
6. Once you have entered all the data, you can create a chart by selecting the Month and Actual Cost columns, and then clicking on the Insert tab and selecting the Line chart option. This will create a basic S-curve chart.
   
7. You can customize the chart by adding titles, labels, and formatting options. For example, you may want to add a title that says "Project S-Curve" and label the x-axis as "Months" and the y-axis as "Cost". You can also change the color and style of the chart to make it more visually appealing.
   

That's it! You should now have a complete S-curve chart for your project. Let me know if you have any questions or need further assistance.