Macro to modify property value

Hello I´m new with the use of visual basic in solidworks and I need help with a basic application. After using Property Tab Builder I´m able to set the properties required in my shop BOM´s, but I´d like to automatically set the Description text value depending on the Thickness value. I think Case function could be used to list all the possible cases but I´m not really sure how it can be done.

For example, in this case I´d like to get "Plate 15".

Thank you

SolidworksApi macros