Hi,
Sorry, but not quite sure what the issue is here.
We have to be sure that the existing hierarchy is on a supported migration version (in your case, you have to be on sccm 2012 r2 sp1); We install our new Hierarchy (new site server, site code, etc.); we use migration wizard to complete the migration.
The migration related documents are:
https://docs.microsoft.com/en-us/sccm/core/migration/prerequisites-for-migration#BKMK_SupportedMigrationVersions
https://docs.microsoft.com/en-us/sccm/core/migration/migrate-data-between-hierarchies#typical-workflow-for-migration
https://docs.microsoft.com/en-us/sccm/core/migration/administrator-checklists-for-migration-planning
https://docs.microsoft.com/en-us/sccm/core/migration/migrate-data-between-hierarchies
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