Once you have developed a set of Mathematica functions you would like to use in Excel, you can collect cells that define the functions in one place to make it easier to transfer the code to Excel.
To deploy this code as an Excel function, you will need to copy the contents of the notebook cells that define the function to an initialization code box in an Excel workbook.
Here is how to do this.
1. Create an initialization code box in Excel:
2. Copy the code from Mathematica:
3. Paste the Mathematica code into the Excel code box:
You can now use the Mathematica function you created inside Excel.