UPC_YS_STEP_USAGE 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 "Notes on Using Characteristic Relationship" 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_UPC_YS_STEP_USAGE TYPE UPC_YS_STEP_USAGE.
The UPC_YS_STEP_USAGE table consists of various fields, each holding specific information or linking keys about Notes on Using Characteristic Relationship data available in SAP. These include ORD (Sequence of Step Applications), BASEAREA (Planning Area), BASEAREATXT (Name of Planning Area), AREA (Planning Area)... 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. .