Welcome to the Asana Community Forum @Tracy_Kaeff 
It is currently not possible to link your Outlook calendar.
I recommend upvoting here: Real time, two ways Calendar integration
In this thread also some workarounds are mentioned such as zzbots.
If none of the tools allow you to sync more outlook calendars into one Asana project you can just set up rules to multi-home all tasks.
I hope that helps!