[chirp_users] Merging files?

[Phaeton]

How do I merge data from a CSV file into a file read
from the radio? If I import, it just overwrites the previous
read data. I want to take a file with 10 channels and import
a file that has 20 channels. ending up with 30 channels
Can that be done in a bulk
fashion or does each channel have to be copied and pasted? 
I know that can be done because I've done it but can't
figure out how to do 20 or more in one feel swoop. 

Sent from my 15.4" MacBook Pro, i7 quad core 

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