BUS000_EXT is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "CBP: Read general data plus standard address" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_BUS000_EXT TYPE BUS000_EXT.
The BUS000_EXT table consists of various fields, each holding specific information or linking keys about CBP: Read general data plus standard address data available in SAP. These include ADDRNUMBER (Address number), TYPE (Business partner category), BPKIND (Business Partner Type), BU_GROUP (Business Partner Grouping)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .