You can use control level processing to create structured lists. Control levels are determined by the contents of the fields that are to be displayed. there is a control level change whenever the content of a field changes. This means that there is no point in creating control levels unless the data are sorted.The data to be displayed must be saved temporarily if you want to use control level processing. You can also use internal tables and intermediate data sets.You can use an array fetch in a SELECT statement to fill an internal table in one go.
You can use the APPEND statement to insert table entries at the end of an internal table. The variant of the APPEND statement on the slide is permitted only for standard or sorted tables. After an APPEND statement, system field SY-TABIX contains the index value of the newly inserted table entry.
You use the COLLECT statement to generate unique or compressed data sets. The contents of the work area
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