AnsPress shortcode cannot be nested.
It will be helpful to know if you want to export to Poland or import to Poland. Which country you are importing or exporting is also necessary. Some countries have free trade agreements and some require more extensive custom clearing. What method of delivery? Air? Train? What product? Guns versus grain v different items are regulated differently. After you provide the information you will get a much better response.
Poland-export.com is an excellent resource for importing or exporting to Poland. They also have a directory. The directory and site are good places to find your joint venture partner