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Your question is a little confusing. Assembly and Disassembly are for use with products that have BOM's. Do you run production orders for device labels?
If you want to change quantities or move to a different location, why don't you just use an inventory transaction?
Alternatively, if you have some reason for using Production Order Processing for the labels, why not make up a dummy BOM. We typically use 1/10,000 of a washer or bolt as a dummy component.
Hope this is helpful.