OpenCart 1.5.4 - how to add global custom fields?

Question

opencart

Good day everyone! It is necessary to add arbitrary fields that will be filled in one place in the admin panel and displayed on the site on certain pages (in the category + in the product cards of this category). The search for a solution was not successful, it seems like it is possible to create a field for goods, but this is not it.
Thanks to!

Answer 1

Good day! I will not write a specific solution, but I will direct where to think. There is a module system, if the module is set to display in products, then it will be displayed in the product, we make a duplicate of the module and set the display in the product category and now 1 module is displayed in both products and product categories. Now you just have to add your module, and this is already simple.