This template displays the number of work items that are not in statuses with the Done status category and whose parent is the current work item.
Configuration
To use the Count open child items template, simply select it from the template grid. Filter by Status to find it faster.
Parameters
This template does not require any additional parameter configuration.
Expert mode
If you switch to Expert mode you can see the Smart field in the Expression Parser. You can now tweak the expression to create a custom smart field based on this template.
Expression
General expression:
%{count(issuesFromJQL("statusCategory in ('To Do','In Progress') and parent = " + %{issue.key}))}
Display as
Number
Formatting style
Default (unformatted)
Used parser functions
The links lead to the JWTC documentation because the parser functions are shared functionalities.