Flash :: Programming As Oppose To If/else If Etc?

what i mean is, is there a way in AS3, or in programming in general(php, js etc) to make an event fire/activate "WHEN" something does something, as oppose to an if/else if / else statements ? for example, say i want to make an event fire /activate ONLY when a frame label is hit, and thereafter , do something else etc, essentially making it do things one by one down the line according to WHEN certain objectives are met.is there a "when" type of statement etc that will do this as oppose to if/else if etc???

for example, using the above example, instead of me doing something like this:

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