how to add custom fields values in URL

[forprobe]

Hi
the following link
index.php?option=com_virtuemart&keyword=&lang=en&limitstart=0&view=category&virtuemart_category_id=277&virtuemart_manufacturer_id=23
shows all products from both a category and a manufacturer

also in left will appear some custom fields
let's say that I have a custom field with the id=40, and inside it 3 values: red, white, black

how can I modify the above link to have also the resulted items (selected by category & manufacturer) filtered also by color, let's say white?
I imagined something like
index.php?option=com_virtuemart&keyword=&lang=en&limitstart=0&view=category&virtuemart_category_id=277&virtuemart_custom_fields[40]=1 - the red part is not working
also, in the filter where the custom field is present, the white color should be checked

Is this possible?

I'm using VirtueMart 3.4.2
Regards

[PRO]

yes all this is possible,
This is doable for a developer, but it sounds like you are not advanced enough.

why not use an existing filter solution?
https://breakdesigns.net/extensions/joomla/custom-filters