Can a custom field refer to the Affected Services field on a form

[Ste404]

Hi there,

I have Affected Services on the Request a change form, but I wanted to have a second drop down box display values based on the selected service.

In Assets I have applications that run off a value in Services, so when Service A is selected the second drop down shows the Applications that have a reference to Service A

I can't seem to get the filter scope to work properly to be able to limit the values based on the affected service selection

Thanks

[Ste404]

I know I can build a customfield and point it at Services then run an automation to update Affected Services on the issue to ensure the parent affected issues field is in sync with the new field I created, but then I basically have two services fields on the issue view