c{O,D}   appears to be a cost matrix showing the costs from each of the two origins to each of the two destinations.     x{O,D} looks like it will be the optimal number of items to ship from each O to each D, subject to the various specified constraints.   And here endeth my understanding of proc optmodel.   But (edited addition):  what data set do you want?  Input data for proc optmodel,  or output results?  I imagine proc optmodel has a number of syntax options that include specifying data sets for problem parameters or optimization results.   In the problem you presented, which I ran, it looks like it makes no sense to send any of the Pittsburgh supply to Boston. ... View more