Welcome to the community!
Here is an existing thread that you may find helpful, https://community.tpg.com.au/t5/Home-Phone-Voice/Call-Diversion/td-p/1851.
Let us know should you require further assistance.
How do I transfer all incoming calls to my home NBN phone number directly to my mobile? I don't want my home phone to ring - just to divert the calls straight to the mobile.