There are various utilities that can be used to edit packet captures. The four that come with wireshark are editcap, mergecap, reordercap, and text2pcap.
Don't forget to spellcheck your pcaps!
I am still making order out of chaos by reinvention. — John le Carre
Merge captures together
Write programs to handle text streams, because that is a universal interface – Doug McIlroy
Put a hex on your hex