How to populate a different dropdown list based on selection of a value in the first dropdown field?

Hi there,

I am trying to make a selection from one drop-down list (Service) that populates different items in the second drop-down list (Units of measure).

I found another similar question in the community but when I use the code (I am not a coder) I keep getting the following error- syntaxError: unterminated string literal 4: at line 5.

Here is the code:

if(event.value == "Storage")
this.getField("Unit of measure 2.0.12.1").setItems(["Per Standard* Pallet","Per Non-Standard Pallet","Per Bin","Per Square Foot"]);
else if(event.value == "IN Handling")
this.getField("Unit of measure 2.0.12.1").setItems(["Per Pallet 'IN'","Per Carton 'IN'","]);
else this.getField("Unit of measure 2.0.12.1").clearItems();

if(event.value == "Item1")
this.getField("Dropdown2").setItems(["Item 1","Item 2","Item 3"]);
else if(event.value == "Item2")
this.getField("Dropdown2").setItems(["Item 4","Item 5","Item 6"]);
else this.getField("Dropdown2").clearItems();

  This is not the complete drop-down as I wanted to try it first. Also, I am guessing this would go in the first dropdown field? I would really appreciate some help!