I took a look at this today - and the dependencies here are all pretty complex and I guess this export is just not going to give you what you want - I will explain in a minute. I suggest that you save your project as a new project and then delete the things that you don't need and start from there - I cannot get the Boreholes to transfer with all of their content. Having aid that I do note that the Strata Layers come across as Strata Surfaces, and they will recompute if you switch between Depth and elevation computation method etc. so they are evidently carrying some of the extended data with them to facilitate that - however they are are going to be detached from your Takeoff and I don't think you will be able to reassociate them unless you use the Save As a new project approach.
The dependencies here are complex and I guess we have not plumbed all of those into the VCL exporter - see below
The Strata Surfaces themselves are dependent on
- The Boreholes
- The Original Ground Surface defined
- The Define Strata List
- The Materials defined in the MSI Manager
The Define Strata List is dependent on
- The Surfaces Method
- The Original Ground defined in the strata list
- The Materials defined in the MSI Manager
The Original Ground is dependent on
- The Takeoff Layers categorization
- The objects on the layers categorized as Original Ground plus any other objects added to the Original Ground surface using Add / remove surface members
So in order to take the Strata Layers to a new project via VCL we would basically need to reconstruct the Takeoff setup, The MSI Library, all of the Original Ground Source Data, The Original Ground Surface, all f the Boreholes and their content, all of the strata surfaces etc. and that evidently is not happening here - I have logged this in as an issue to look at. The Boreholes themselves have dependencies on the strata lists and the MSI Manager so it is not as simple as just selecting them and exporting them because of the dependencies that are built in.
Hope that this explains the situation and an approach that you can take that will work
Alan