There are two possible ways to select a bundle of photos for reconstruction:
After uploading a photo set, select the photos from the list on the Layers Panel by checking / unchecking the relevant photos. Then click Start 3D Reconstruction. The reconstruction will be performed only from the checked photos.
After uploading photo set, select the photos on the map by drawing the polygon around the cameras. To do this, right-click the Photos on the Layers Panel. Click Select workspace area, and start marking around the needed area on the map. When finished marking, right-click to close the perimeter of the selected area. The photos within only the selected area will be used for reconstruction. Please note that the workspace selection option can be done only when the photos come with the GPS data in order to display them on the map.