You can find a detailed description of how to set project defaults and the purpose and usage of each project default in Project Defaults.
The project defaults needed for the Excel export and import are listed below.
ZP_TP_BID - Template name for the bid export from P.30.24.
ZP_TP_PCO - Template name for the PCO (Potential Change Order) export from SM.40.01.
ZP_TP_PK - Template name for the package export/import (without release notes) from P.70.74.
ZP_TP_PKRN - Template name for the package export/import (with release notes) from P.70.74.
ZP_TP_TRFC - Template name for the traffic data export from P.80.51.
ZP_TPL_XLS - Template name for the expediting export/import from P.70.71.