PCASUB 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 "EC-PCA: Substitution in Sales Order" 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_PCASUB TYPE PCASUB.
The PCASUB table consists of various fields, each holding specific information or linking keys about EC-PCA: Substitution in Sales Order data available in SAP. These include MVGR1 (Material group 1), MVGR2 (Material group 2), MVGR3 (Material group 3), MVGR4 (Material group 4)... 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. .