BPDY_ADDON 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 "Budgeting/Planning Screen Fields" 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_BPDY_ADDON TYPE BPDY_ADDON.
The BPDY_ADDON table consists of various fields, each holding specific information or linking keys about Budgeting/Planning Screen Fields data available in SAP. These include DISP_DIST_BUDG (Display Distributable Budget)... 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. .