how to move 20 issues from one person to another 2 person each person 10 tickets at a time
I am afraid you have to do it one set at a time.
Bulk edit the first 10 issues to move them to one person and bulk edit the next 10 issues to move them to the other person.
See https://confluence.atlassian.com/jiracoreserver073/editing-multiple-issues-at-the-same-time-861257342.html for more details.
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