Go to the
Configuration menu > → System Values: Advanced > → Tax Offices.
Click the Add button on top of the Tax Offices table. You will be directed to the Add Tax Office page.
In the Name field, provide the name of the new tax office.
Provide the necessary address details.
Decide whether this tax office should be Active and thus selectable.
Decide whether this tax office should be marked as a Preferred Item and thus appear on top of the drop-down lists.
Decide whether this tax office should be a Default one.
Click the Save button.