Attachmovie?

I have a movieclip (holder) which contains an empty movieclip (picholder).
Inside holder I am doing some tweening on picholder.
On my main timeline, I want to dynamically create multipe “holders” and load jpegs into their “picholders”.
I then want to be able to play the tween on the image (which is defined in holder).

Would I use attachMovie to dynamically create “holders”? (I have holder linked for AS export)? Or would duplicateMovieClip be better? Or neither.
And then can I call gotoAndPlay on the holder instances??

I am so confused!! Hope I haven’t confused you too…