prexpresso,
You cannot apply exceptions to a single text box for specific records.
You can, however, create a second layout where you'll use different text boxes and properties, and then put a condition on the two layouts to select only one of them per data page. You can click on your layout, and go to the Properties(go to Window->Properties if you don't see the window), then under "Action", you can click on the expression to access the Expression editor.
For layout 1, you can use:
IF((RECORD_NR() = 245) OR (RECORD_NR() = 258) OR (RECORD_NR() = 500) OR (RECORD_NR() = 600), Skip, Print)
For layout 2, use the opposite:
IF((RECORD_NR() = 245) OR (RECORD_NR() = 258) OR (RECORD_NR() = 500) OR (RECORD_NR() = 600), Print, Skip)
If you're on one of the four records, it will use layout 2, otherwise it will use layout 1.
Of course, feel free to create more than two layouts, and to apply more conditions if you want the four records to have their own specific settings.
Hope that helps!
Regards,
Raphaël Lalonde Lefebvre