create sub-category under (main category)

If the templates are directed to all categories of members interests, then this should be organized according to each industry or niche Because every niche is has many micro-niche This makes it easy to make templates more custom based on their subclass And with the sub-category we will make each template defined according to the interests allocated under each micro-niche And it will also make access to it faster, according to the industry of each member example main category: social media - All -- sub category: instagram -- sub category: facebook -- sub category: twitter - - templates inside twitter: 1- twitter ads. 2- twitter bio. 3- ..etc