We use LA in a non typical matter than most of you might. Nothing spammy but ideally we would like to enter in multiple email addresses to one link request.

Is this possible to do or must we create duplicate columns and a unique email for each one?

It is possible to add one more address to CC and BCC fields when you sent e-mails via LinkAssistant. Just select the partner in the workspace - right click - choose 'send e-mails to selected partners' - a new window pops up - there you right click the 'From' field and check CC and BCC - thus these fields get added to the e-mail. But still, you can enter only one address per field.