Extrapolate Boxes
The Extrapolate Boxes option allows you to insert boxes with the same frequency or pattern as a set of previously created boxes. This function is especially useful for "normalized irregulars" where simply inserting additional issue boxes would require modification to match the irregular publication pattern. Extrapolating the already-modified pattern eliminates the additional modification.

Examples of "normalized irregulars" can include a monthly magazine that is published only 11 times a year (e.g. American Libraries) or a daily newspaper that is published 5 times a week (but not Saturday and Sunday). (E.g. Wall Street Journal or USA Today)

NOTE: Millennium extrapolates only the enumeration and chronology; notes are not carried over to the new issues.

Extrapolation is covered in the section of this tutorial.