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what if you had two majors, how do you indicate that?

They dont seem to have a proper box for this so just type it in where it says Degree

There are usually space in the actual application for you to put in text so you can list them both manually. Most fields don't get populated properly, so you will have to do manual editing anyway.

I am finding that most of the primary applications don't provide enough room - for example Boston College.... should I just attach?

for example, at BC - I can't fit Philosophy and Theatre Arts... I also can't fit my academic achievments