CEDST 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 "Structure of selection table for segment table/level" 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_CEDST TYPE CEDST.
The CEDST table consists of various fields, each holding specific information or linking keys about Structure of selection table for segment table/level data available in SAP. These include SUBNR (Subnumber for seq.number for selection condition), FNAM (Field Name), SIGN (SIGN field in creation of SELECT-OPTIONS tables), OPTION (OPTION field in structure of SELECT-OPTIONS tables)... 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. .