 <p>You can achieve this by specifying things you want to show on card in <code>cardConfig</code></p> <pre><code>cardConfig: { fields: [ 'Name', 'TestCases', 'c_StoryType', 'Children', 'c_TargetRelease', 'PlanEstimate' { name: 'Children', renderer: this._renderChildStories }, ], } </code></pre> <p>and then define <code>_renderChildStories</code> function, I thing <code>value</code> will be a collection of child stories, so you can loop that depending upon the <code>val</code> value</p> <pre><code>_renderChildStories: function(val) { var store = Ext.create('Rally.data.custom.Store',{ data: [ { 'FormattedID': val.get('FormattedID'), 'Name': val.get('Name') } ] }); return store } </code></pre>