Hi @drossi :
I assume there is a SP list named DrossiList.
1\Set the Dropdown control 1(Dropdown1)'s Items property to
Choices(DrossiList.Category)
2\Set the Dropdown control 2(Dropdown2)'s Items property to
Switch(
Dropdown1.Selected.Value,
"Red",
Filter(Choices(DrossiList.'Sub Category 1'),Value in ["Gas","Water"]),
"Blue",
Filter(Choices(DrossiList.'Sub Category 1'),Value in ["Leak","House"]),
"White",
Filter(Choices(DrossiList.'Sub Category 1'),Value in ["Apartment","Office"])
)
Best Regards,
Bof