how to split investment income after cra download

i've successfully downloaded cra info into turbotax! (this is a great system!)

 

the T5 amounts went into my return because i was the first person on the form.

 

however, we have always had our accountant manually split investment income 3 ways (son, wife, myself).

 

can i reduce my T5 amount to 33%, add 33% to my wife (doing both returns together) and manually add 33% to my son's return when he does his?

 

does turbotax have a place where i can edit amounts already downloaded?

 

thx!