WBS nameing convention starting with -

Hi PS Experts,

I need that default WBS which are created should appear with separation of - by default.

EG-

For exmaple now when i am creating wbs for project G-shift name is coming like (Default)

1)G-shift1

1.1)G-shift11

2)G-shift2

2.1)G-shift21

I need it to be like

1)G-shift-1

1.1)G-shift-1-1

2)G-shift-2

2.1)G-shift-2-1

Thanks

Suraj