Originally Posted by
747jetter
Do you search it as multi city on delta website?
No. I first searched BOS-LIM roundtrip on Google Flights to find dates with Z availability on ATL-LIM (you could also do this using ExpertFlyer or BCD Travel Inventory site).
You also have to do the same for LAX-BOS. Then, once you have these anchor dates, put them into a multi city search on Google Flights and play around with the connection cities, so I searched on Google Flights (all with under 24 hour connections; the fare rules say 1 stopover allowed, but I couldn't get it to price):
BOS-SLC
SLC-LIM
LIM-SLC
SLC-LAX
LAX-BOS
Then, once you have the exact flight numbers, plug those into Matrix, then use a booking extension or bookwithmatrix to feed it to delta.com. Hope this makes sense, ask questions as you need to.