add dependent cc email list

Good Morning!

I need DropDown78 auto popupate and hidden based on Location Inspected selection.

DropDown78 List - 

a@abcd.com

b@abcd.com

c@abcd.com

d@abcd.com

and Location Inspected (DropDown20 - 

A

B

C

D

E

F

I

I need to auto populate - 

a@abcd.com

b@abcd.com

c@abcd.com  

for Location A, B, C

and for 

d@abcd.com

for 

E

F

I

My submit button is giving me error

mailto:hr@xyz.com

and I also created new Ok Button and add code - 

var cToAddr = "hr@xyz.com"
var cCCAddr = this.getField("DropDown78").value;
var cSubLine = "Checklist 2024"
this.mailDoc({bUI: true, cTo: cToAddr, cCc: cCCAddr, cSubject: cSubLine});