Classes are a powerful tool in intermediate to advanced level VBA programming.
In three separate workbooks, we have created useful userforms using class modules :

- Fast percentage calculation form
- Product discount calculation according to quantity,price and percent rate
- Hiding / displaying the columns of sheet (Column management with userform)

View tutorial's here :https://youtu.be/eBg4xnw9NM4

Example files can be downloaded from Youtube link.