PowerApp get less alternativ in subcategory when you choose a category

Question

I have a problem when i choose the katergoy i get al the subcategory and i just want the subcategory that are matched to the category

Filter(Möbler; 

Or(IsBlank(DropdownKategori.Selected); 
Kategori.Value = DropdownKategori.Selected.Value

&& 

IsBlank(DropdownSubKategori.Selected); 
SubKategori.Value = DropdownSubKategori.Selected.Value

&& 

IsBlank(DropdownColor.Selected); 
Color.Value = DropdownColor.Selected.Value

&& 

Bokad.Value = "Nej"
)
)