Help Simplifying Javascript for a repetitive code! - Please

I have made a form with the purpose of having multiple dropdowns for inserting an 'ID number' which would then populate the following text fields: 'description,' 'quantity,' and a 'unit.' 

This form is working perfectly as intended but I was wondering if there was a better way to code it.

There is a very repetitive code which is needed for assigning the dropdowns to the corresponding fields:

function SetFieldValues1(cID1) {
    this.getField("Desc1").value = DeptData[cID1].description;
    this.getField("Quan1").value = DeptData[cID1].quantity;
    this.getField("Unit1").value = DeptData[cID1].unit;
}
function SetFieldValues2(cID2) {
    this.getField("Desc2").value = DeptData[cID2].description;
    this.getField("Quan2").value = DeptData[cID2].quantity;
    this.getField("Unit2").value = DeptData[cID2].unit;

,Etc....

and this is linked to the dropdowns as such:

(ID1)Custom Keystroke Script:

if( event.willCommit )
{
   if(event.value == " ")
     this.resetForm(["Desc1","Quan1","Unit1"]);
   else
     SetFieldValues1(event.value);
}

(ID2)Custom Keystroke Script:

if( event.willCommit )
{
   if(event.value == " ")
     this.resetForm(["Desc2","Quan2","Unit2"]);
   else
     SetFieldValues2(event.value);
}

,Etc....

Is there a simpler way to do this? 

Any help would be amazing

Thank you all in advance!

-Flynn Hammonds