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Determine the Form Grid Field ID. In this example, it is "entries".

Construct the JSON object that correspond to the item row's form.
Knowledge Base for v6 > Add a new Row in Form Grid using script > Screenshot 2015-11-19 09.19.33.png

var args = new Object();
args['result'] = '{"amount":"1","category":"Medical","claim":"","purpose":"a","date":"11/18/2015","formattedAmount":"$ 1.00"}';

Based on the identifier in #1, call the FormGrid's add method to add a new row.

// the field id is "entries"
var field = FormUtil.getField("entries");
var functionName = window[field.attr("id") + "_add"];
if(typeof functionName === 'function') {
    var args = new Object();
    args['result'] = '{"amount":"1","category":"Medical","claim":"","purpose":"a","date":"11/18/2015","formattedAmount":"$ 1.00"}';
    functionName(args);
}