COBTR 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 "Cost fields for a period" 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_COBTR TYPE COBTR.
The COBTR table consists of various fields, each holding specific information or linking keys about Cost fields for a period data available in SAP. These include WKG (Total Value in Controlling Area Currency), WKF (Fixed Value in Controlling Area Currency), WKFS (Fixed Value in Controlling Area Currency), WOGR (Total Value in Object Currency)... 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. .