GEOG 70 - 3D Diorama in ArcGIS Pro Pt.1 

A little puzzled about the export/import part. I usually create an area of the desired size and shape by: 1. Create a polygon feature class called AOI (Area of Interest) 2. Create a rectangle covering the desired AOI and save 3. Run Clip Raster on any involved layers 4. Remove the full coverage layers, leaving only the clipped AOI size layers remaining.

And … You can do ‘convert to Local/Global scene”, retaining the layers of the initial map, I believe