Increase Mortgage File Years by 1/2

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From: Ty Archer (Archer_at_discussions.microsoft.com)
Date: 11/23/04 

Date: Tue, 23 Nov 2004 13:09:22 -0800

How can I increase the years on the excel mortgage file by 1/2 years. So far
it only lets me insert years between 1 & 30. and I wish to enter 3 1/2 years.
Thanks Very much.