Pay a minimum half of the cost for the catalog or manual that your partner prepares. Think together with them. When Japanese companies try to export their products, they prepare English catalogs and manuals at their expense. They prepare demonstration units at their own risks. They always try to know and understand everything their partner does overseas.
Any products have life and any products can be copied.
However the name and the philosophy of your company cannot be copied so easily. Think about the companies doing successful business in Japan such as Taylor Hobson, Carl Zeiss, Hewlett Packard, IBM etc, all of them are selling their company and philosophy. They are always trying to let their customers understand and appreciate what they think and what they do. Many American and European companies, who try to sell their products only and let their partner in Japan prepare catalogs showing the product name and specifications only, failed. Select the best person to take care of your partner to keep good communication and mutual understanding.