ActionScript 3.0 :: Creating Template MovieClip On Timeline?

I have some AS which loops through a section of XML and creates an MC for each entry. I now need to add some text (from the XML) and a dotted line to each MC. Which I'm not sure how to do with AS. So I think it would be easier if I created the 'template' MC on the timeline (or library?) which would then be 'duplicated' as necessary. But how would I do this in AS3?

This is my code at the moment:
ActionScript Code:
for (var i:Number=0; i<mainXML.images.length(); i++) {
var motionImgMC = new MovieClip(); // create an MC.
motionImgMC.name = "mc_" + i; // give new MC a new instance name
motion.addChild(motionImgMC); // add new MC to featured
motionLoader.addItem(mainXML.images.[i],
motionImgMC, {title:"Images"}); // add image in XML to new MC
// push each mc into an array so you can access them from outside this function
motionImgsArr.push(motionImgMC);
}