mixdown edit from a vst

Hello dear Cubase pro 8 user!
Could someone tell me how to edit an audio mixdown from a vst cubase project?I don’t find the"Import project"in the mastering section from cubase pro 8!I’m asking what I do wrong?
Else I ve tried to import the cubase project into the wav lab audio editor,the sound is awfully compressed,I think the sample rates are wrong,and trhe project=as edit is shorted from 5mns to 16seconds! :smiley: thank you a lot,wodansohn