I will try to explain I make let say 1 hundred copys of my first comp wich has a control precomp layer and a Baseshape precomp layer.
all the comp are named 0,1,2,3,4,5,6,7,8,9 and so on
and I need to replace the Baseshape precomp in comp1 with the comp 0 and in comp 2 with comp 1 and in comp 3 with comp2 and in comp 4 with comp 3 and so on.
maybe my first test will help.