You don't - it's not a JIRA field, it's either something your administrators added wherever you saw it before (and has not been added to your current installation), or it's a field provided by an addon that you had on the old system but not the new one.
I'd take a guess at Tempo (Folio) being the addon, if it was an addon.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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