Yes, You can add new filed in V/03 if filed is not available.
As the field (LZONE) is not available in the system, so it should be appended to required table with the help of ABAPers.
KOMK (header level) , KOMP (Item level) According to the position of the field (LZONE) at sales document, that field can be appended to KOMK or KOMP and KOMG
Pls follow the below path to append new field
Path: IMG Sales and distribution System modification Create new fields (using condition technique) New field for pricing Use include for the new fields in dictionary.
Append LZONE in KOMK / KOMP and KOMG, After adding this filed you can create new condition table.
you can search in forum, same has been discussed.
If the field is not available in the CONDITION TABL Field Cataloge then you have to first maintain it in the FIELD CATALOGUE of the Table
For this you have to do the SYSTEMS MODIFICATION
Please chck the below link for the SYSTEM MODIFICATIONS.