Populate a text field, from a selection choice from a drop-down menu

bless you, thank you so much for your help however I have tried that and it doesn't seem to work, I did find a solution which was this:

var f = this.getField("2dd"); // Replace "OutputText" with your text field's name

if (event.value == "COLLECTION") { // Replace "Option 1" with your dropdown item

    f.value = "COLLECTION";

} else if (event.value == "REBOOKED") { // Replace "Option 2" with your dropdown item

    f.value = "REBOOKED";

} else if (event.value == "REPAIR") { // Replace "Option 3" with your dropdown item

    f.value = "REPAIR";

} else if (event.value == "RTB") { // Replace "Option 4" with your dropdown item

    f.value = "RTB";

} else if (event.value == "DAMAGED") { // Replace "Option 5" with your dropdown item

    f.value = "DAMAGED";

} else if (event.value == "CANCELLED") { // Replace "Option 6" with your dropdown item

    f.value = "CANCELLED";

} else {

    f.value = ""; // Clear the text field if no matching option is selected

}

However I have found another problem that you may be able to help if you dont mind me asking....

I have a drop down menu with 5 drop down items:

H9

HL

HM

HN

W1

this drop down menu only appears once, but I would like my choice (example: "HL") to populate across various places (in fact 11 Places)  in my form (its a long form)

if this make any sense at all.

so what I am saying is a make my choice in the drop down menu, but my choice with appear in 11 different text fields.

Go to dropdown field 'Validate' tab and enter this script:

this.getField("2dd").value = event.value;