Mapping custom fields from one module to another

I have a custom field, "Subscription Period" that appears as a required field in every Opportunity (Potential). I want that field to appear on any Quotes derived from that Opportunity (and have created a custom field of the same name in Quotes for that purpose). What are my (non-programmable) options for linking the two? I know that the field will be mapped to an Invoice or Sales Order going forward, but how do I "back map" it to the original Opportunity? The solution must be obvious, but I'm not seeing it. Any help appreciated.

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