Save an N time as a custom period

Save an N time as a custom period

I am using AD Audit Plus version 4.6.0 and build 4685 and have tried and tried and looked for a way to save an N time as a custom period. There are a ton of options in the standard dropdown, and you can save a date to date custom period. However I dont want to save Nov 25 to Dec 11 as a custom period. I want to save the "Last 14 Days" as a custom period.
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