[iTunes] Can one permanently merge "tunes" after importing

[Carol F. Bruml]

I have several concertos, symphonies, etc., that I imported before I knew
how to merge the movements within them, so they would play as a single
continuous piece, even when my iTunes or iPod are set to randomize the order
of songs.

I do not see any way to merge these pieces into single segments within
iTunes. Is there any other software available that will let one merge tunes
(merge movements of a piece) into single pieces, AFTER the tunes are
imported, or do I need to try to find the CDs and import them again?

Carol