Siemens SIMATIC PCS7 Manual page 120

Recipe creation
1. Sequence:
Generation
Selection
Manipulation
4-24
All SFC structures can be embedded vertically in sequences. They guarantee
a temporal sequence of execution for the substructures.
A first sequence is generated as a starting diagram in a new recipe while
subsequent sequences will always arise as part of parallel or alternative
branches. They cannot be created explicitly.
An entire sequence is selected by clicking on the vertical connecting line or
by lassoing it (or part of it).
Sequences or parts of them can be copied, deleted or moved. When inserted
in parallel and alternative branches they form new branches.
Batch flexible , Manual
C79000-G7076-C650-02