If "fazer parte" means to take part in something, how can you express that you will "do part of something"? I thought this sentence meant that we will do part of that...
The same way! (Be part of = ser parte de, fazer parte de)
Can it also be "We are going to do part of that." or "We are going to make part of that."?
Yup. We most of time say "fazer parte" (to take part),but they used "to be", so i think they should accept that