Okay....
I don't know studio view, but assume it's the same as the others.
There should be "add measures" listed under the <Edit> menu.
For adding "parts" I assume you mean more instruments, right? For that you need to be in the "Staff Tool" (looks like a treble clef) and then there should be a <Staff> menu where you can add "new staves" which will give you a new instrument part.
...
Another thing to do next time would be to press <F1> anytime you have a question.... ;)