Hi BGaurav,
The entries in the T185* tables are cross-client and in the vast majority of these are SAP delivered entries. Customer entries are permitted, but only in the defined customer range of Z8* and Z9*. See report RDDKOR54 with the view V_185F.
You are reminded that you can transport the contents of tables between systems - so you don't have to manually create entries in these tables in every system.
Andrew