I am wondering if i can redeem my skymiles on a partner's Codesharingflight

for example, can i redeem virgin australia'

VA 5509 and VA 5508
Sin- syd and syd to Sin

the other thing is i am based in singapore and need to head Sydney! and i have about 120k skymiles, anyone know how else i redeem a ticket!

any help is appreciated!
thank you!