Autonumber and file name must be different

We have set auto number for creating new CAD documents and by default the file name is set same as auto number but I want to give my own unique file name when creating the CAD document in Creo session.

I have tried the following options

1. Creating a CAD document in Windchill we can enter the File name even though we have auto number but in Creo session it is not possible.

2. After creating the CAD file in Creo session we will have the auto number but after upload we can change the file name even through the number will be auto number

But all the above options are tedious process for creating any new CAD file

Any idea in this regard will be very helpful

-Praveen