It can be useful to filter on a custom field based on the value of another custom field.

Take the following example, of an organization with multiple divisions, where each division has multiple teams.

An area where this is very useful is in building forms. You can have a form field (say "Affected Teams") to require another field to be previously set (say "Division") before you can set it.

Let's walk through how this works in practice using those example fields.

Go to Settings > Custom fields > Edit "Affected Teams".

Set the Filter options based on the value of another custom field to the custom field you want to depend on. In this case, we have an attribute "Division" in the catalog entry for "Affected Teams" so that is what we select.

Say you have the following form setup, which is getting a bit long. What you want is to show the user the picker for "Affected Teams" only when "Division" has been set.

The way we filter a custom field ("Affected Teams") based on another custom field ("Division") is to edit the "Affected Teams" field so that it only shows when the incident has "Division" set.

Below you'll see that "Affected Teams" won't appear until a "Division" has been selected.