1.Go to the list which you want to copy.
2.Go to List tab on the Ribbon and click List Settings.
3.Click on "Save list as template" under Permissions and Management section on list setting page.
4.Fill out the required fields.Mark "Include Content" if you want to copy the list contents also.
6.Go to the subsite where you want to create anew list based on saved list template.
7.Click Create List. You will find your saved List template there as a list type to choose.
8.Kudos!! You have made it.
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