Copying records within a file

[James Lampert <jamesl@xxxxxxxxxxxxxxxxx>]

I'm working on a program that has to copy a block of records within a 
file. That is to say, given a block of records, in the file FROBOZZ, 
with keys:

    foobar 15 1
    foobar 15 2
    foobar 15 3
    foobar 15 4
    foobar 15 5

I want to duplicate the records, still in FROBOZZ, keyed as:

    bozbar  7 1
    bozbar  7 2
    bozbar  7 3
    bozbar  7 4
    bozbar  7 5

or, conceivably, if there's already a "bozbar 7 1," the copies might be 
keyed as "bozbar 7 2" through "bozbar 7 6."

I don't relish the thought of having to keep track of the position from 
which I'm reading records. Can I have the FROBOZZ physical file open 
twice within an RPG program? Or is there an easier way to do this?