Hi Aamer,
You have two options:
1. Instead of standard COPY package use script logic data copy with*DESTINATION_APP and RUNLOGIC BADI to be able to run scripts in other cube. In the same script you can launch (by RUNLOGIC) another script to do calculations in Target cube.
2. Create a custom process chain that will include both COPY and running script logic.
B.R. Vadim