Choose a position for the slide

Hello

I wonder if there's a way to choose the position of an item in the slider.

Let me explain:
Currently, I have a content type "article" and a view "slider" (view slideshow) which display the last "article" nodes in 9 slides.

Now I am looking for add a new field (we'll call it "position_slide" by example) to my content type "article". A drowpdown of number 1 to 9.

So when I create an article with "position_slide" egal to 2, i want that article goes to the second slide of the slideshow, and if a create another article with "position_slide" egal to 6, I want that article goes to the sixth slide of the slideshow.

And if I have 2 articles with "position_slide" egal to 5, the newest is display in the fifth slide.

I don't know if im very clear... and sorry for my bad english.