ADDPFM in as 400

The Add Physical File Member (ADDPFM) command adds a named member to the specified physical file, which must already exist on the system. A member must be added to the physical file before the file can have data stored in it. The first member of a file can be added by entering an ADDPFM command or by specifying a member name in the MBR parameter of the Create Physical File (CRTPF) command. To add other members to the file, use the ADDPFM command to specify each one.
http://publib.boulder.ibm.com/html/as400/v4r5/ic2931/info/cl/addpfm.htm
http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=%2Fcl%2Faddpfm.htm
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example.
in this example my pf name is pf005