attaching movieclips with a for loop

Hello there, I am stuck with changing from a random attachMovie to an orderly attachMovie set up

The initial setup was for a mc to be randomly picked and displayed from a pool of mcs
This was realised with having four levels
a) pool of movieclips "mcPool"
b) movieclip with "mcContainer" to which mcs of "mcPool" are randomly attached, by changing LinkageID with Math.random
c)another movieclip holding b) to tween it into motion with a stop function at the end of the timeline.
d)Scene1, attaching movieclip c) to a container and removing movieclips at the end of the timeline.

The stop function at the end of c) in combination with the removing of mcs at the end of d) initiated the random pick from the pool in b) with each loop of the timeline of d).

Now I would need b) to pick from the pool in a certain order. I cannot think of a way how I can get b) to count and the to store the incremented variable so that it is available again when d) attaches c) again after the timeline loop.

I realise that I might have to reorganise the whole construct and would be happy about help.

Thank you in advance

Parlian