I've done this before from a 4 to a 5. Bought a 6 and I can't recall how I did this.
Googled and I can't find it. 
TIA!
Sorry I found it:
http://www.iclarified.com/31189/how...ne-airport-extreme-or-time-capsule-to-another
TIA!
Sorry I found it:
http://www.iclarified.com/31189/how...ne-airport-extreme-or-time-capsule-to-another