The {billaddress} only is working fine but I need to get each Address separately in one custom field

try using SUBSTR function. It takes 3 parameters: String column name, starting index and length of substring: This allows you to take substrings of text. You may need to run multiple or play around with it to parse it the way you need.

There was an issue with workflows only accessing Item Sublist. Is this Zip code going to be coming from an inaccessible Sublist?