In what phase are file "merged"?

In PMS 9.2 is says:
The call order for upgrading, downgrading or reinstalling a package is:

    pkg_pretend (only for EAPIs listed in table 9.2), which is called outside of the normal call order process.
    pkg_setup
    src_unpack
    src_prepare (only for EAPIs listed in table 9.3)
    src_configure (only for EAPIs listed in table 9.4)
    src_compile
    src_test (except if RESTRICT=test)
    src_install
    pkg_preinst
    pkg_prerm for the package being replaced
    pkg_postrm for the package being replaced
    pkg_postinst


It does not say where in this list new files merged and old files unmerged, can anyone enlighten me?

 Jocke