how to export Tekla BIMsight in Tekla 2019
You can use "Publish to Tekla BIMsight" feature. But i suggest you check how to export the model in IFC and how to add that to a project in Tekla BIMsight. With IFC you can update the model in Tekla BIMsight and you don't need to always get whole new project. And with IFC export, you can control what properties are exported.
Tekla User Assistance's help on this:
PS. This question would be more appropriate on Tekla BIMsight's own forum here:
Retrieving data ...