RMB on a part or assembly in the Model Browser, select Component from the drop-down menu, the select Demote. It will call up a dialogue box for the new file name.
All constraint will be honored as you then demote items to the new sub assembly. Give it a try for patterned as well. I never had the need to demote patterned, give it a try. You should be able to then drag it down into the new sub assembly in the Model tree.
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