latest Date entry Field automatically shown

latest Date entry Field automatically shown

Hy,
Have 3 Forms in my Application.

In 1st form have three fields->   single_Line , Multiline_1 , Multiline_2
In 2nd Form have two Fields-> Date_1 ,  Note_1
In 3rd Form have two Fields->  Date_2 ,  Note_2

when i put entry  on single_Line Field then automatically  Multine_1  filled with  Note_1  and   Multiline_2  filled with  Note_2

Needed In between Multiline_1 and Multiline_2 whom have Latest Note(Note_1 ,Note_2)Shows only which is sort by Date desc, and Other Multiline field will be hide Automatically .
How can i achieve this ?
Thank you in Advance.