Separating full sections into parts (Eg. clarinets into Clarinet I and Clarinet II)

Hi, I am making a symphonic work for my youth orchestra and I need to separate out the sections into parts as mentioned in the title. So I know how to get the parts from the score, but they are not the discrete parts for each player. For example, the Clarinets are all in the same part. I looked this up, and it said I could make parts from each voice, but the way I wrote the parts this would not work as they are in different voices depending on which part to make the readability easier for the conductor(ie stem direction), and in some parts they are all the same voice. I realize that in future, I should just make them the same voice for each part, but for now, I have a problem: should I go through the entire score and make the voices the correct way for when I part it out, or should I just manually make the parts? Or is there an easier way to do this that I'm not seeing?

Thanks in advance