Conditional Filtering in the Items of a dropdown input?

[cmnflom]

I know that it's possible to filter a gallery based on a dropdown, but I wanted to know if it is possible to do the opposite as well?  

I have a gallery where users will go and update two columns of each row by using a dropdown.

My question is, can you filter what appears in the Items of each drop down based on what the selected row's "Item Type" is?

I was thinking of doing this by creating a collection and putting that in the Items of each dropdown - but that keeps giving me errors. How can I create conditional filtering within the dropdown Items?

[RandyHayes · Accepted solution]

@cmnflom 

Yes this can be done.  First, skip the collections and just put it in your Dropdown Items property.

ex. with static values:

Switch(ThisItem.ItemType, 
    "ItemA", ["Option1", "Option2", "Option3"],
    "ItemB", ["OptionY", "OptionZ"]
//...etc...
)

With Dynamic Values:

Switch(ThisItem.ItemType, 
    "ItemA", Choices([@someListA].SomeColumnA]),
    "ItemB", RenameColumns(Distinct(someListB, SomeColumnB), "Result", "Value")
    "ItemC", RenameColumns(Filter(SomeListC, SomeCriteria=SomeCriteria).SomeColumnC, "SomeColumnC", "Result")
//...etc...
)

The options are endless!!

I hope this is helpful for you.