SEL_FIELDS_CRM 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 "Collection of Fields for Master Data Selection" 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_SEL_FIELDS_CRM TYPE SEL_FIELDS_CRM.
The SEL_FIELDS_CRM table consists of various fields, each holding specific information or linking keys about Collection of Fields for Master Data Selection data available in SAP. These include READ_OPT (Indicates how Hier.-Dependent Data Segments Are Linked), MAX_PARTNER (Maximum Number of Partners per Read Transaction), MD_STATUS (Status of the master data extractors)... 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. .