Hi Sharlyn,
it can certainly be done, but it is not a built-in feature of the module, so it will require some SQL tricks. Are you ready? Let's go: first, we need to create the user that will manage the blog on the target portal. Go to the target portal and register the new user. Once we created it we must get his userID, so we enter the target portal as host, goto SQL and run this script:
SELECT UserID
FROM {databaseOwner}{objectQualifier}Users
WHERE Username = 'xxx'
where xxx is the new blogger's username. Now write the new user ID on a paper. Step two: move the blog from one portal to the other, and link it to the new user. Let's run this SQL script:
UPDATE {databaseOwner}{objectQualifier}Blog_Blogs
SET PortalID='xxx', UserID='yyy'
WHERE BlogID='zzz'
where yyy is the userID that you wrote earlier, xxx is the target portal ID, zzz is the blog's ID (that will not change). Remember that all the images will be broken if their address is relative, unless you move them to the new portal. Let me know if it works.
Best regards,
Dario Rossa