Filter category, checkboxes category with amount

-- HikaShop version -- : 4.1.0
-- Joomla version -- : 3.9.8
-- PHP version -- : 7.2

Hi there,

I want to create massive filter bar for Hikashop products.
Like: tweakers.net/categorie/822/tablets/producten/

Site is ugly but it has 3 things i really like to have:
1. Is it possible that it works like the site above that all the categories stay there when i select one?
2. Is it possible to show the amount in the category label like the site above?
3. Is there an Ajax option for this filter? (now it refreshes the page).

Thanks!

Question one 1 fixed.
Not make it deletable

This filter system does do it.
And i can imagine that it only tels how much is in that category, not how much it will show with other filters.
ja-megafilter.demo.joomlart.com/index.ph...e&sortdir=asc&page=1

I would like this feature.
You see that on many site's so that will be a great one if you ask me.