XS_CONCRETE_PART_NUMBERING_START_NUMBER
Category in Advanced options dialog: Numbering
Use this advanced option to define a start number for concrete beams, panels, and footings. The default value is 1.
If you change the value, the new start number only affects the parts that are created after the value has been changed.
This advanced option is model specific and the setting is saved in the options database. Reopen the model to activate the new value.