Add Creation date from G/L Register to G/L Entry Table

I have only been using NAV for a short time, but the little i have leaned i was able to add a Field in the G/L Entries table and how it in RTC.

What i still do not know how to accomplish is to link the creation date in the G/L Register table. I am only currently pulling the date if it falls at the ends of the range in the "From Entry No|To Entry No." fields in the G/L Register.

How can i modify this field to be able to look for Entry Nos. that fall within this range and pull the corresponding Creation Date?

Thank you all for you assistance.