Layout key SAPSFCAS27

Gurus,

How to add and remove the fields from Layout key SAPSFCAS27.

I wants to add MATNR and to remove some fileds.

It is under Overall profile SAPSFCG014 >> Table SAPSFCL015 >> Layout ID >> SAPSFCLA24 >> Chart No 02 2nd chart (dispatched) >> Grouping SAPSFCGR02 >> Layout key SAPSFCAS27.

Thanks

Suresh