Fetch retrieves a protein structure from the PDB and loads it into PyMOL. The PDB file is saved in the current working directory for PyMOL.
fetch PDB_ID [ ID2...IDN ] [, async = [0,1] ]
To specify more than one PDB, just add its ID to the command line (without adding spaces).
# fetch them singly fetch 1kao fetch 1ctq # fetch them at once fetch 1kao 1ctq # fetch them at once synchronously fetch 1kao 1ctq, async=0