WELD Symbol ( ISO Symbol)

I read  the Symbol key ref index in Isodraft manual, it shows like User can't define or modify Weld symbols..... But i badly in need of 'WW' weld symbol with Dimension. any one can help me......

I read  the Symbol key ref index in Isodraft manual, it shows like User can't define or modify Weld symbols..... But i badly in need of 'WW' weld symbol with Dimension. any one can help me......