I know we have to send them through collegeboard, but if we report them on common app doesn’t every college see them? Can I choose which college sees them?
If all your schools require official score reports as part of the application there may be no need for you to complete the test score portion of the CA at all. It’s a judgement call. Also, you can certainly remove the scores from the CA for some schools and then put them back for others. Your choice.
Not all colleges using the CA will view the test score section and it will tell you so on the CA when you are completing the application for that school. At the very least, you can generate a preview to see what the school sees.