This could help you, https://migrations.atlassian.net/wiki/display/UWC/UWC+User+Documentation
You can refer to the section export and conversion sections.
For common questions, you can look at https://migrations.atlassian.net/wiki/pages/viewpage.action?pageId=1015819#UWCF.A.Q.-Conversion
if you need any other help, please let me know.
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