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There really is no "defined" way to move the OMS to a new server during 10g -> 11g upgrade. The best advice would be to add an additional OMS to your 10g env, duplicate completely (patches, etc). Then remove the old host when satisfied. Then upgrade that new host. The upgrade needs to be done on the node that will remain due to the Admin Server placement.
It might be good to look at EM 12c now that it's available, as you can do a 2 system upgrade which will help in the relocation/upgrade process by using the new hw for the new OMS installation.