Hi Naresh,
the values are stored in the following tables:
CRMC_MKTLIST_M1 ELM Mapping Format Type
CRMC_MKTLIST_M1T ELM Mapping Format Type Description
CRMC_MKTLIST_M2 ELM Mapping Format Component
CRMC_MKTLIST_M2T ELM Mapping Format Component Description
CRMC_MKTLIST_M3 ELM Mapping Type-Component Relationship
However the tables have the maintenance status "N Display/Maintenance Not Allowed", therefore in standard you can't change the same.
If you want to add any category you need to change the maintenance status in trx SE11 and maintain the values in the corresponding tables.
best regards,
Johannes