I have a dataverse table named Site Items with 2 columns, Item and Material Site.
Item is a lookup and points to Name column in the table named Items .
Material Site is also a lookup that points to Name in the table named Material Sites .
I have a combo box named cmbItem who's data source is Items with primary text set to Name that when selected I want another combobox named cmbSite to display every Material Site Name from Site Items when the records value in the Item column is equal to what is selected in cmbItem.

I played around with Filter(Choices( but im lost. I also see i might need to use something like [@'Site Items'].'Material Site' ?
thanks for the help.