i have done this for an invoice
for a BILL TO and SHIP TO
sections, side by side
I used a temp field.
before printing the invoice, I ran a process which calcs the 2 "address blocks", this also allows removing of blank lines when a "Address Line 2" line is empty.
after the process, I print the invoice which has 1 field for ShipTo and 1 for BillTo
BUT...
remember when you put a tag in the report writer, that means 1 Open and 1 Close marker:
<<Customer.Name + SystemSettings.CR + Customer.Address + SystemSettings.CR + Customer.Account>>
... where SystemSettings.CR is a 1byte field for CHR(13) carriage return