Hide or SHow report data

[GaNGeR]

Hi, don't know if this is too easy, but eitherway, I'm struggling with it so...

I've made a report to send monthly invoices. For each costumer, I have two adresses, one showing the street and matching state, zipcode, one showing the PO Box with matching state, zipcode. If I show them both, it's a bit too much on the report.

I only want to show the street and matching data if there's no PO Box available. Can't do this with a query (I think) because all records need to be involved, sometimes they just have to be hidden, at least some of it.

any ideas?

Thanks