This type of thing is not a do-it-yourself project. You need to consult with a tax professional who is experienced with international taxation. You may also need to consult a tax professional and/or business lawyer in that other country.
EDIT: For others reading, see the poster's other question here:
https://ttlc.intuit.com/community/business-taxes/discussion/tax-complications-if-expand-business-to-...
