EXPD_SUBOBJ_FIELDS 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 "Progress Tracking Subitem Data" 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_EXPD_SUBOBJ_FIELDS TYPE EXPD_SUBOBJ_FIELDS.
The EXPD_SUBOBJ_FIELDS table consists of various fields, each holding specific information or linking keys about Progress Tracking Subitem Data data available in SAP. These include ICON_EVENTS (Event Maintained), TRINDEX (Row Index of Internal 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. .