We would like to create project asset per Payables Invoice

We would like to create project asset per Payable invoice and associate asset lines to that asset. Can I get a sample as how to do this? Oracle client ext package PA_CLIENT_EXTN_PRE_CAP_EVENT (called from PA_CAPITAL_EVENTS_PVT.CREATE_PERIODIC_EVENTS) and PA_CLIENT_EXTN_CIP_ACCT_OVR (called from PA_FAXFACE.GENERATE_PROJ_ASSET_LINES)

Which package to use to achieve this or would need to use both?