Xpedition Package Integrator will do this for you out of the box plus so much more!. Package Integrator - Mentor Graphics
In AATK I have a script that you will need to do some work to but it starts a new project from a keyin. It's in AATK/FlipChip/Default/MGC_FC_PACKAGE_FLOW.efm
I dropped support for this script when xPI was released as a tool.
--kendall