Fill textbox and the following auto fill with data from the first

hello just wanted to help me want to put a two textbox but I want to fill the first depending on the data in the first place the other auto fill the following
for example
my first textbox I want to have limit to accept these values ​​nomas 109080 = 1.2, 110077 = 12cc, 12cc 660060-7 =

109080 I want to put the textbox immediately put 1.2

I hope I can help
regards
Bill