Hi - upon import the estimates on the issues should be preserved and taken into Portfolio. Do do see them showing up in the import dialog in the estimate column still (before confirming the import)? If no, a potential reason might be a mismatch in the units - if the plan is in story points, only estimates on the story point field will be taken in, if it is in days or hours, only time estimates are considered. you can double check the scheduling unit in Plan>Configure>Scheduling Settings.
If none of this explains it, please raise a support ticket to investigate further. Thanks!
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