Filter doesn't contain in project

In one of my project i have a multi-select custom field. I would like to filter all task that don’t contain specified selections from my custom field. Is it possible to add such feature?

Welcome to the Asana Community Forum @Patryk_Marek :wave:

That currently works via the project filters.

Under “filters” within a project click “Add filter”

Then scroll down to locate the relevant multi-select custom field and you have the ability to pick which options should show and which not.