I would like to have a dropdown, which only displays results depending on the selection within another dropdown.

The case is that we have several production sites, and several production cycles on each site. I have one column and one dropdown, for both the site and the cycle ID. There are hundreds of production cycles, selecting the one needed is not very convenient.
I would like to select the site(s) in the first dropdown, and only have the relevant cycle ID-s listed in the second.
We tried chained select statements but no luck. Do you have an idea? Is it even possible?