Hello @Jake_Tukua, welcome to the Asana Community Forum 
When you export via Asana directly you could then make changes afterwards but that is probably not what you wanna do 
Asana2Go also offers nice export features: Asana2Go: Copy, export, and print from Asana flexibly (Free for most users/companies)
Bridge24 offers reporting and export functionality too: Bridge24 + Asana • Asana