You can intersect points with angle only measurements and adjust their coordinates using a network adjustment in TBC. The key is both radiations need to have the same point identifier. I edited the point numbers in the optical spreadsheet once in TBC which then gave me the option to merge the points. You may be able to do this in the field as well. Once the radiations were merged, the point was created. The network adjustment can then be completed as normal and an error ellipse will be created for the point. You will need to make sure that you are intersecting radiations that create a decent angle (not a sharp angle) in the field to get a good result. This feature must have been included in a more recent version of TBC as I am certain I could not do this a couple of years ago. I am now using TBC 5.2 which enables this to be done.