Stu already replied there to let you know there is no easy way
to do an import from the OS X Keychain. If you are technically
inclined, a passionate user wrote a script that handles some of
this for you:
Thanks for your quick reply. I have downloaded the script, but I
probably won't use it unless I get a lot more practice with
scripting and Terminal, etc.. I am puzzled about this situation.
Communing with Keychain would seem to be high on the priority list
for this development.
Support Staff4 Posted by Dave Teare on 20 Jan, 2012 03:24 PM
Thanks for the update John. You're right, this is a key feature
we'd love to add. The problem is the way the OS X Keychain is
designed. It hasn't seen a meaningful update in many years and it
has some critical limitations that make it very painful to use. The
script above works around many of the problems but it is error
prone and many of the techniques used will not be allowed by Apple
when we submit updates to the Mac App Store.
In any event, that is our problem and not yours. We're still
searching for a workaround that can be used by non-power-users.
Hopefully we can find one.