I read the document placed at https://confluence.atlassian.com/display/JIRA/Configuring+Sub-tasks but there is no explanation if it is possible to configure sub-task fields for a specific project rather than all projects in jira. Maybe by adding a new property at workflow step or transition?
The bad news is that there's no way to select fields on sub-task display. You either have the field on screen or you don't.
But, configuring "fields per project" is a standard function in Jira. It's actually "fields per project and issue type" - a lot of people only do it by project, but you can easily say "Field X only appears on sub-tasks and technical tasks in project X" - see https://confluence.atlassian.com/display/JIRA/Configuring+Fields+and+Screens
And, of course, if a field is not valid for a sub-task, it won't have data and hence won't come out in the sub-task display.
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