How to make a submenu per category

Hi,
I want to make some submenus, or some links to posts or categories to apear on some categories.

Let me explain, is like in joomla. When i enter in a category I want to show a menu only in that category under the main menu, and i want to show a different menu for more of 30 categories, at this time i made an test that is working great :

At this time i have somehting like this “:

<?php
if ( in_category('fotbal-romania-liga-1'))
{
   echo "<div class='liga1'><a href='https://pariuri-x.ro/clasament-fotbal-romania-liga-1.html' title='Clasament fotbal - Romania Liga 1'>Clasament Liga 1</a> | <a href='https://pariuri-x.ro/program-si-rezultate-fotbal-romania-liga-1.html' title='Program si rezultate fotbal - Romania Liga 1'>Program si rezultate liga 1</a></div>";
} 

if ( in_category('fotbal-romania-liga-2'))
{
   echo "<div class='liga1'>
<a href='https://pariuri-x.ro/program-si-rezultate-fotbal-romania-liga-2-seria-1.html' title='Program si rezultate fotbal Romania Liga 2 Seria 1
'>Program si rezultate Liga 2 Seria 1</a> |
<a href='https://pariuri-x.ro/clasament-fotbal-romania-liga-2-seria-1.html' title='Clasament fotbal Romania Liga 2 Seria 1
'>Clasament Liga 2 Seria 1</a></div>
<div class='liga1'>
<a href='https://pariuri-x.ro/program-si-rezultate-fotbal-romania-liga-2-seria-2.html' title='Program si rezultate fotbal Romania Liga 2 Seria 2
'>Program si rezultate Liga 2 Seria 2</a> |
<a href='https://pariuri-x.ro/clasament-fotbal-romania-liga-2-seria-2.html' title='Clasament fotbal Romania Liga 2 Seria 2
'>Clasament Liga 2 Seria 2</a>
</div>";
}
?>

This shows the submenu (submenu is acsualy some code with links) i want for each category i selected.

but i have mor ethen 30 categories, it is ok to have so many if ?

Or wich will be the fastest method ?