Insert brands into the main menu?

Question

1C-Bitrix

Hello everyone!
I don't understand php at all.
Bitrix has just begun to study The
question is the following:
Please tell me how to implement a menu with a selected list. As on the site, https://premium-ekb.ru/ , the top menu, specifically the brand tab.
I've been scratching my head for 3 weeks now. I understand that the truth is somewhere close. But no help. Thank you.

Answer 1

The question is not about php and not about Bitrix. I don’t know what you did for 3 weeks, but the finished version is googled in 2 minutes https://codepen.io/samiralley/pen/nxeKeq