System development in Excel is about methods and approaches applied to programming with VBA in Excel. This category includes free templates that includes Excel add-ins and object-oriented programming for instance.
Here you can download an Excel workbook with VBA code that is ready to be saved as an Excel add-in.
Here you can download free code to create your own functions (UDF) in Excel with custom descriptions, a user-defined function (UDF) can be placed in an existing or a new category of functions.
In this workbook, we have used the concept of object-oriented programming (OOP) when we have written VBA code to perform tasks in the workbook.