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lfInstantHook({"customfield_XXXXX", "customfield_YYYYY"}, "hook.sil");
lfWatch("customfield_XXXXX", {"customfield_XXXXX", "customfield_YYYYY"}, "hook.sil", {"change"});

string v = argv["customfield_XXXXX"];

if (v == "Option 1") {
    lfAllowSelectOptions("customfield_YYYYY", {"None", "1A", "1B", "1C"});
} else if (v == "Option 2") {
     lfAllowSelectOptions("customfield_YYYYY", {"None", "2A", "2B"});
} else {
     lfAllowSelectOptions("customfield_YYYYY", {"None"});
}