I purchased Go central with a Square integration a little while ago.
There is NO option to add county or city taxes - even manually.
Customer care tells me - two different guys over two different calls - "they have never heard of this issue before I raised it." Wow! Just read through the other threads on this.
Option? Switch to WordPress - which is effectively a non-option for someone like me who can't manage it.
Other option? Pay Godaddy fat amounts to do it for you.