list subcategories from any given category in wordpress

Good afternoon. I want to create a single [login to view URL] template that shows the subcategories of any given category in a certain way. So the parent category is a variable. For example, after clicking a category MAIN we have to see a structure like this MAIN SUBCATEGORY 1 Subcategory title Thumbnails of posts belonging to this subcategory MAIN SUBCATEGORY 2 Subcategory title Thumbnails of posts belonging to this subcategory MAIN SUBCATEGORY 3 Subcategory title Thumbnails of posts belonging to this subcategory etc The order of the subcategories has to be RANDOM, but the order of the posts inside each subcategory has to be by date, descendent Is it possible? Thank you very much