Anyway to add or change tax options?

[Lonck]

I would like to add more tax options or, if not possible, change the existing ones. What do I have to do?

[Primo]

I would like to add more tax options or, if not possible, change the existing ones. What do I have to do?

You can´t add more Tax options. Neither can you really change the existing ones - It is possible to rename them in something else, but the effect of them can´t be changed.