Anything will help

[Terri]

I am currently working on a db and not good with expressions. If there is any help it would be greatly appreciated.

I have a checkbox, when the checkbox is true I need the value to from one cell copied and inserted into another, If the value is false then it is blank to be filled out.
Such as when the BillTo is checked address, city, and zip will then populate the ShipTo address, city, and zip.
My fields are
Company
Contact
BusinessPhone
MobilePhone
Address
City
State
Zip
CompanyAddress
CompanyCity
CompanyState
CompanyZip
BillTo (Checkbox)