Import TestCase with Test Plan mapping

[AutoTestLink]

Hi Team,
Need to import test case template with linked Test Plan specified.
Is there a way to do this?
I am using TestLink 1.8.5 with "AMP".
Reading the import and export format documentation I found no samples to import with Test Plan.
The issue is when are uploading TestCases in bulk (XML) with Requirements linked.
We could do with requirements linked but could not do with linked Test Plan.
Manual assignment of Test Cases to Test Plan takes time.
As per the input and export formats I believe its not supported in TestLink 1.8.5?
Please let me know how to do this if possible.

Thanks in advance.