In any Custom Block settings in CMS there is present a field 'Parameters', the variables that can be used there are: item_id - for products, articles and ads ids category_id - for any kind of category ids manf - for manufacturer ids search_string - when user is doing some search article_id - to show block only for some articles example: You can create different Custom Blocks first, then go to CMS > Pages Layouts and add the blocks to the pages where you want to show them and when you click on block's settings specify in the pop-up window the following string in the 'Parameters' filed: category_id=13,48 13 and 48 are the categories where the block will be shown.