Is it possible to filter items by Category in a custom item filter?
Solution 1:
Sure, the most convenient way is to use FilterBlade in order to achieve all of your filtering needs. This is the most commonly used filter creator that we have.
In the customize section, there are sections for all of the tiers of flasks, armors and weapons and everything else. That is where you'll want to customize your loot filter accordingly.
You can also link your POE account directly to it, so you don't have to save and upload the file manually.