Reversed Autobuild

Forum,
I trying to find a way to create a negative Autobuld.

Meaning (eg) 

I purchase a pack of 6 Christmas Tree Decorations  (seaonal example :-) Part Number 0006

1 x 0006 = 6 pack Tree Decoration  @ $60

However I want to sell each Decoration as asingle item eg part number 0001

2 x 0001 = 2 tree decorations $20

Is it possible to do a negative Autobuild  that decrements my stock of 1 x 0006 and creates 6 x 0001?