What I do is when I create the blocks with attributes. You could label the attributes Beam Size input 12". Then use export attribute command and export the information into excel. The problem I think you would have with this is in order for all the beams to be counted in the block you would need to have 12 attributes labelled Beam Size 1 - Beam Size 12, unless you can create an excel file template that would have a formual in it to count the number of beam sizes. See Attached. Hope this helps or atleast get the wheels turning toward a better solution.