populating drop down list with multiple items

[BoilerEng1]

I am just starting to use Adobe Designer 7.0.  I am creating a form that the selection form one drop down list will populate another drop down list.  I'm trying use an If statement in addition to an addItem.  This is what I have so far:

if(LevelCode1 =="101 - Controls"

then(LevelCode2.addItem("101 - Boiler System controls");

LevelCode2.addItem("102 - Temperature Switches & Sensors"))endif