Ingesting PST data under Managed Folders

In case where mailbox folder sturuture is like below due to retention period

eg. Mailbox\Managed Folders\1 Year - working folder
eg. Mailbox\Managed Folders\2 Year - longterm folder

You select your PST in outoook (or suggest same users to do) and create folder sturuture like below inside the PST
Managed Folders\1 Year - working folder\PST_Folder1

And run wiard based PST migration, during PST Migration where you need to specifiy migration settings.

Select "Root folder" and select "merged" option, which combine the folder structure of an imported PST with the existing folder structure.
(Like screeenshot)

In another PST you can create struture like "Mailbox\Managed Folders\2 Year - longterm folder\PST_FOLDER2"

I hope above option may give some futher idea in order to archive what exactly you want.