If you mean rcshwb.p which in my case in Pre-Shipper/Shipper Workbench then keystroke cimload in terminal mode could have some issues. I did a quick try of doing a shipper on unconfirmed order.
If in fact it could work there is plenty of cells to fill wich void or values.
As you can see on 32soft they have loader for that.
So a Cimload from excel could work.