You can copy a logical RMSfile with toolkit as follows:
Start toolkit on your database:
c:\> toolkit dbname
Select 1 - Data Files Menu from the Toolkit Development Menu.
Select M2 - Copy Definition and Data from the Data File Menu.
Enter the original logical RMSfile name in the Data File Name to Copy field, and the new logical RMSfile name in the Data File Name to Create field. Press STORE <F5> to copy the file, or CANCEL <F1>-X to return without copying the file.
To copy a logical RMSfile with a command, enter:
c:\> lfcopy -v lfold lfnew
Lfold is the logical RMSfile name for the old (source) RMSfile, and lfnew is the logical RMSfile name for the new (destination) RMSfile.