SYNCHRO Plugin only exports what's visible in the current 3D View. To have better control over different phases of construction, you can create phase-specific 3D Views in Revit and export multiple SPXs from them. This will create a nice tree-hierarchy in 4D Pro. Alternatively, simply expose all phases in Revit 3D View and export a singular SPX, but use User Fields to filter out Phase Construction in 4D Pro directly.
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