Number of sub-tasks based on status and work item type

Configuration

Create a Custom smart number field and use the General parsing mode.

Expression

%{count(filterByIssueType(filterByStatus(subtasks(), "Done, Completed"), "Sub-task, 
Sub-story"))}

Please, note that by changing "Done, Completed" into other statuses  and "Sub-task, Sub-story" into other issue types, you can adapt this use case for your needs. 

Format

Default

Used parser functions

The links lead to the JWTC documentation because the parser functions are shared functionalities.

• count()

• filterByIssueType()

• filterByStatus()

• subtasks()