Make three menus with three category levels

Question

I want to have 3 menus of categories, and each menu with diferent level of categories.

First menu with First level categories:

• category 1
• category 2
• category 3

If I go to the first category, I want to show a second menu under de first one with child categories of current category:

• subcategory 1.1
• subcategory 1.2
• subcategory 1.3

And finally, if I go to subcategory 1.1, I want to show a new menu with child categories of current subcategory:

• subsubcategory 1.1.1
• subsubcategory 1.1.2
• subsubcategory 1.1.3

Answer 1

wp_list_categories(); will by default give you a hierarchically nested list of all your categories. Hiding and showing that list, or parts of it, is just a matter of CSS. That sounds like what you need. For example

echo '<ul class="my-cats-list">',wp_list_categories(),'</ul>';

// style rules; put in your theme's style.css
.cat-item {
  padding-left:5px;
}
.children {
  display:none;
}
.cat-item:hover>.children {
  display:block;
}

That is very minimal but does work.