Categories in broadcasts

Can you make categories in broadcast? Like a Boys section in which only boys play and a girls section in which only girls play.

I think you mean the grouping system
Basically there are several Broadcasts associated
For certain reasons, the power of grouping lies with the site's official broadcasters

So if I want to use this grouping system what do I have to do. By the way, I use the Lichess Game IDs

As I said: the grouping system is available to official broadcasters (special permissions for site administration)
Sources using Lichess game IDs is not a problem

So how do I do it @SergioGlorias ?

https://lichess.org/help/contribute