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After talking with  Jean Bidlot  we concluded that what we are asking our contributors for in GRIB2 language is :
  

parameter

( WMO GRIB 2 )

DisciplineCategory
parameter
Number
Gridvertical levelDescription
1 U-component of wind  ( 10 m )  0 [ M products ]  2 [ Momentum ]2

. regular lat-long grid

. grid spacing free for the contributor to chose

. not need to be global

. bitmap ?

Code table4.5 – Fixed surface types and units

    ??

102 Specific altitude above mean sea level

103  Specified height level above ground

 

 

 

 

 		 
2 V-component of wind ( 10 m )  0 [ M products ]  2 [ Momentum ]3 
3 

Significant height of combined
wind waves and swell

10 [ O products ]  0 [ Waves ]3 ??

typeOfFirstFixedSurface = 1

[Ground or water surface]

   

101  Mean sea level

 

 

 
4 Peak wave period10 [ O products ]  0 [ Waves ]34Mean  wave period based on  the second moment of  the frequency spectrum
5 Mean zero-crossing wave period10 [ O products ]  0 [ Waves ]28 
6 

Direction of combined wind
waves and swell

10 [ O products ]  0 [ Waves ]14

Mean  wave direction

...

(grib2/tables//4.5.table)
 

parameter Name

DisciplineCategory
parameter
Number

vertical level

(grib2/tables/2/4.5.table)

horizontal grid

 time

(grib2/tables/2/4.4.table)
bitmapfile
u-component of wind

(WMO GRIB2 compliant)

0

 

2

22

typeOfFirstFixedSurface = 1 
[Ground or water surface]
scaledValueOfFirstFixedSurface = 1

 

typeOfSecondFixedSurface = 255 [Missing ]

scaleFactorOfSecondFixedSurface = 0
gridDefinitionTemplateNumber = 0 [Latitude/longitude]
latitudeOfFirstGridPoint = 90000000
longitudeOfFirstGridPoint = 0
latitudeOfLastGridPoint = -77500000
longitudeOfLastGridPoint = 359500000
iDirectionIncrement = 500000
jDirectionIncrement = 500000

 

 

IndicatorOf
UnitOfTimeRange = 1 [Hour]   


bitMapIndicator = 0 
[A bit map applies to this product]


ucomp.grib2
v-component of wind 

(WMO GRIB2 compliant) (grib2/tables/2/4.2.0.2.table)

023vcomp.grib2
Significant height of 
combined wind waves and swell

(WMO GRIB2 compliant)

1003

height.grib2