Here is the example what I try to do:

There is one field is CD Track Title. When the new record just created, only one row (one field) appears on the layout. After fill out first CD Tr-title within the field, I need second row (same definition field - Tr-title) automatically availble.

How could I do that?

Thanks

You can't automatically add fields, but you can have a portal displaying track titles, and easily add an additional row for each track. You need to set up a second "Track" file with a relationship from the main CD file. You should have an auto-enter serial number text field (called CDrecordID) in the main file, and a standard text field (called CDrecordID) in the Track file. The Track file should also have a field for the track title. When you set up the relationship, choose the CDrecordID field on both sides of the relationship, and select the "allow creation of related records" checkbox. Then, in your main file, place a portal on your layout using this relationship, and place the track title field from the Track file in it. Now, when you click into a new blank line in the portal and start typing a new track name the related track record is created automatically.