Showing Items and sub items in a portfolio

Hello

I have a problem with showing my (sub-)portfolio.
I tried to find the solution in the forum of Enfold, found a lot of info, but it did not solve the problem.
As a photographer I want to show my portfolio. The portfolio should be a drill down:

Portfolio level 1 should show (e.g.):
STEDEN (Cities – subitems) (A)
REIZEN (Travel – subitems)
MACRO (no subitems)
ETC

When I press STEDEN (A) you should see the cities in STEDEN (level 2)
– GRONINGEN (subitems B)
– LEEUWARDEN (subitems)
– WENEN
– ETC

When I press GRONINGEN (B) you should only see: (level 3)
– – BINNENSTAD (C)
– – CRUISE SHIP
– – UMCG
– – ETC.

When I press BINNENSTAD (C), a new page will open with the photos of the BINNENSTAD (C) using the gallery item
I organized my Portfolio Categories as above:

PORTFOLIO
A REIZEN (Travel)
A1 Dubai
A2 Noorwegen
A3 Etc

B STEDEN (Cities)
B1 Groningen
B1a Binnenstad (Innercity)
B1b Cruise ship
B1c UMCG
B2 Leeuwarden
B2a Haven
B2b Beeld

I also installed the code below I found on different Enfold pages in this forum and put it in the function.php of the child theme to hide the sub items

add_filter( ‘parse_tax_query’, ‘enfold_customization_products_remove_children’ );
function enfold_customization_products_remove_children( $q ) {
if ( is_tax(‘product_cat’) ) {
$q -> tax_query -> queries[0][‘include_children’] = 0;
}
}

OK. So far so good.

I make a new PORTFOLIO page with a portfolio Grid. In the Portfolio Grid I select: REIZEN, TRAVEL, MACRO (no sub items) etc , save the page and update. What is shown is: almost ALL sub-portfolio items… but NOT TRAVEL (level 1) and STEDEN (level 1). MACRO (also level 1) with no sub portfolio shows up!
It should show:
REIZEN, STEDEN and MACRO

I hope I made myself clear and that you can help me. It is rather confusing…

Thanx in advance