Hi @Remo Jagst ,
Do you want these two Drop dowm be like: when user select "A" in Drop down1 then user can only select "D" in Drop down2?
Per my test, you could use the following code:
If(DataCardValue6.Selected.Value = "A", Filter(Choices([@testchoice].Shifts),Value = "D"),Choices([@testchoice].Shifts))
My test result: when select "A" in "Department" "D" will be the only choice in "Shfits", when select "B" in "Department" you could select "D" "E" "F"
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