How do you create a calculation in the parent table that will return you the value from a field in a particular portal row of a child portal.

For instance I have record of Contacts and the phone numbers for those records are kept in a related table of Phone numbers. I can manipulate and reorganize the order the phone numbers appear in that table. What I would like to do is have two records in the parent Contact table. One field would be Primary Phone and it would pull via a calculation the Phone number from the first row of the Phone Number portal and Secondary Phone filed would pull the Phone Number from row two of the Phone Number Portal. Kind of the same way the GetRepetition function works only with portal records.

Will the GetNthRecord function do what I want?

Primary Phone:

GetNthRecord( Phone numbers::phone ; 1 )

Secondary Phone:

GetNthRecord( Phone numbers::phone ; 2 )