THIS TAKES ME A BACK A WAYS:
Back in the day, (and I’m talking way back), FileMaker didn’t have portals. Portals were introduced along with FileMaker 3 in 1995. Right now, there are probably more developers that never spent quality time with repeating fields, than us long time veterans that remember when the repeating field was cutting edge FileMaker design.
There are still uses for repeating fields, of course, in a modern database (calendars comes to mind), but when they were uses in place of a portal, way back when, it’s best to switch to a more normalized approach.