By convention,

custom2 = flags to select entries on, comma delimited custom1 = first names for addressing and childrens names. Like : John and Jane, Joyce, Jill, and Joe will print John and Jane

If I have both a street address and a PO box, I put the street address first in the database, followed by PO xxxxx. If I have both, then the zip codes end up in the same sort of order.