Odin (Parallels) does not support downgrading of a license. That means, that if you purchased a 300-domain license, you cannot decrease the number of domains to 100, but you can increase to 'unlimited'. Another example: adding a Power Pack is possible, but you can't delete it from your license once purchased. If you want to have a more restricted license, you need to order a new one, and cancel the current license.
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