In Tekla Structures 2018 SP1, there is now a new advanced option XS_ENABLE_PHASE_OPTION_IN_NUMBERING that controls the Phase setting in the Numbering Setup dialog box. This advanced option is model specific and it is available in the Advanced Options dialog box.
When XS_ENABLE_PHASE_OPTION_IN_NUMBERING is set to FALSE (which is the default value), the Phase checkbox is disabled in the Numbering Setup dialog box. This means that changing an object’s phase works in the same way as in Tekla Structures 2017i and earlier versions and that changing the phase does not affect numbering or trigger change alerts.
If XS_ENABLE_PHASE_OPTION_IN_NUMBERING is set to TRUE, the Phase checkbox is enabled in the Numbering Setup dialog box. This is the recommended setting for Tekla Model Sharing users.
If you select the Phase checkbox, changing the phase of an assembly (or an assembly main part) affects numbering in the same way as the other settings in the Numbering Setup dialog box. Changing the phase of a secondary part does not affect numbering.