http://iscoresports.com/

Does iScore allow you to start scoring in a later inning and simply load the existing score (without other data) at the time you start scoring?
e.g. I arrived late today at my son's game at the top of the 3rd inning with the score already 4-1. I had wanted to simply start scoring in the 3rd and start with the existing 4-1 score. I wasn't worried about retrieving the stats for the first two innings thinking that a "parially scored" game was better than none at all.
Please advise. Thanks.

There is no way to put in the runs scored without entering a way that those runs scored. There would be nothing to stop you from using Misc -> End Inning and Misc -> Skip Batter to get to the right point in the game and continue scoring from that point if all you are interested in is the stats from that point forward however.