Repeating section values based on other field values

[Joanne]

Hello,
I am trying to have the fields in a repeating section only display certain
values, e.g. the value that is in two other drop down lists. I think the
problem is that the user has not filled in the drop down lists when the form
opens so I probably need to delay the "read" that the repeating section does
until the drop down lists are populated. I'm very, very new to InfoPath and
I don't have the slightest idea as to how to go about this? Any help would
be greatly appreciated.