Show other product in the same category as this product on the product details page。【在产品详情页面上显示与此产品同一类别的其他产品】
product are randomly displayed according to the set number. (4 product are displayed by default)。【产品根据设定的数量随机显示。 （默认显示4个产品）】

Demo:
Demo URL: http://opencart.ocxd.cn/index.php?route=product/product&product_id=48
1.Extension>Installer
upload the zip file: category_product.ocmod.zip(上传插件)
2.Extensions>Modules >Category related products
Setting Extension modules【开启模块设置商品显示数量】
3.Design>Layouts>product
Setting layout【布局】