K,M in values

[capriconuser]

this is the expression

Num(Sum({<FYear = {$(vmax_year)}>}[GPremium]),'#,##0.0')

and this shows like this

19,239,246,925.0 now i want to show here K , L , M, BN

how i do this .. like this

19 BN

[capriconuser]

so what is the use of numerical abbreviation ?