MS Excel - Customised auto-numbering in tables (video tutorial)

I made my first ever video tutorial a good while ago demonstrating two ways of creating customised auto-numbering in MS Excel tables.
This is useful when you want more than just a count of 1, 2, 3, ... by combining letters and numbers.

Check it out if you struggle with this.

Please note that Blue Steens does not exist as a business anymore (as mentioned in the video). So, forget about the contact details etc. I'm just posting this to share the knowledge.