Once a Science Goal has been completed, its SBs can be automatically generated by clicking the icon in the toolbar, although the Tool menu has the additional option of generating from multiple Science Goals simultaneously. The action of generation will, if SBs are being generated from the Science Goal for the first time, cause an ObsUnitSet to appear immediately below the Science Goal. The various sub-nodes of this can then be opened to reveal further ObsUnitSets and SBs in a nested structure. If these sub-nodes are already visible and the generation run again, the whole nested structure will be collapsed until only the uppermost OUS is visible. Details of the contents of the SBs can be found in Section 6.2.2.
For each ALMA cycle, the OT's SB generation algorithm is closely tied to the capabilities advertised in the most recent ALMA Call for Proposals and it should be possible to generate successfully from any Science Goal that has been copied from an accepted Phase-1 Proposal. More generally, what exactly is generated will depend on the observing mode.