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Thunderbird Personal Address Book sub folders

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I had several sub folders under my "Personal Address Book" containing selected groups of addressees. When TB upgraded to 102.2.2 they put the address book information on the left side of the screen but did not copy my sub folders. How can I create new sub folders and import the sub folder addresses from my saved .csv files into them. I tried looking up the help files for TB but they were no help.

I had several sub folders under my "Personal Address Book" containing selected groups of addressees. When TB upgraded to 102.2.2 they put the address book information on the left side of the screen but did not copy my sub folders. How can I create new sub folders and import the sub folder addresses from my saved .csv files into them. I tried looking up the help files for TB but they were no help.

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Maybe I did not express myself properly. I had sub address books under Personal Address book which contained the addresses for my immediate family, my friends and golfing buddies. When I wanted to forward or send an email to any of those groups all I had to do is select that group name. Since the upgrade I have not been able to create those sub folders and import the .csv files containing the respective addresses. Any help would be appreciated.