GRFN_S_SELECTION_TABLE 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 "Selection Table" 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_GRFN_S_SELECTION_TABLE TYPE GRFN_S_SELECTION_TABLE.
The GRFN_S_SELECTION_TABLE table consists of various fields, each holding specific information or linking keys about Selection Table data available in SAP. These include SIGN (Selection Table Sign), SELOPTION (Selection Table Option), LOW (Selection Table Value), HIGH (Selection Table Value)... 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. .