The Fotovender bulk order form displays all the products placed into a single category tree that you configure in your site.
We recommend that you create a new top-level category to contain all products that you will offer in the bulk order form. This top-level category can an additional level of sub-categories underneath the top-level category. Most importantly, we recommend that the only products you place into these categories are products that will appear in the bulk order form. If you intend to make the same products available in your site but outside of the bulk order form, we recommend that you create a different category to contain those products.
In the screenshot below shows a top-level category and 2 sub-categories that will be used to contain the products in the bulk order form:
When you create products that you want to appear in the bulk-order form, there are only 2 product types you that will function correctly: Simple and Variable
You may not use any of the product types added by the wp2print plugin such as Fixed-size product or Area product