etc aliases

Hello:

    i have several server with own etc aliases. right now i want to combine it all into a general etc aliases in a new freebsd server. cause it consist hundred thousand of record user inside how to make a shell script to combine it or configure it.

all etc aliases record example: JOHN : 1234567@[10.0.0.2]
name : ID @[ WEBMAIL SERVER]

please consult..Thanks