Help Please on Map File

[Gary Watry]

Here is what I have
I have a database with the following
Fields                Values
Category              'TS' 'H1' 'H2' 'H3' 'H4' 'H5'
ENSOPhase             'El Nino' 'La Nina' 'Neutral'
Major                 'Major' 'Minor'

I know how to filter using the

CLASSITEM "CATERGORY"

CLASS
   EXPRESSION /H1/

What I need to do is filter by ENSOPhase and Major as well as by Category
ie.layer #1
'TS' 'El Nino' 'Minor'
'H2' 'El Nino' 'Minor'

or layer #2
'H4' 'La Nina' 'Major'
'H3' 'La Nina' 'Major'

I build my symbology off the Category Column