Ok. Not sure what direction to go. I am thinking a need a Client Script because it should occur before the User creates a record. Also, the CurrentRecord module I don't think applies because the fields I need to set the default value to are not in the Project Record. One is part of the Billing Record and the other is in a different record type. That's why I believe the Workflow doesn't work on these two fields.

if it helps, what you have described so far can be done in either a user event script or a client script