After swapping substitutes, there is no automatic recalculation of the estimated costs for the workorder.  You have to go into WO-A and then manually recalc costs causing a significant amount of extra time.  There are occasions when we may need to swap subs on 50-100 workorders at a time based upon availability of items.
 
A feature to recalc after swapping would be greatly appreciated and a global recalc estimated costs (similar to WO-K-H) would be nice to catch all the ones that may have been missed up until now.