Often a young swimmer does not have times to enter certain races in open meets. However, times for events can be estimated for an event based on times swum in other events and other distances. There are some tables to allow you to do that called "comparative performance tables".
You can find them by logging on to Swim Club Manager and they can be found under “Club Documents” in the swimming information folder.
Where you don't have times to work from or you are not sure about the entry please contact me .
Keith