Property of the ScriptLine : BookFormat.
The output flow property determines if the output file for the current script will be a single file with all pages following sequentially, or multiple output files.
The default value for this property is single file. In this case when a script is executed, it produces a single output file using the value of the Output Filename property.
When this property is set to sections, then Q++ will generate as many output files as you defined sections in the Physical Sections property. Each output file will be made up of the Output Filename property value, to which the corresponding section name is appended.