Floor Manager Elevation Entry - ABD 829

Why can't I enter in the "Elevation" field in the Floor Manager dialog.  I'm pretty sure we use to be able to do this.  How else would I be able to insert a floor elevation?  For example, in the attached image I want the 4th floor to be below the "Cassette Roof" but all I'm allowed to enter is the floor to floor dimension.  I'm sure I'm just missing something.

John K.

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