IBU of blended hops

Hello:
    Is there a way beersmith can figure out the IBU of blended hops.  I have a DFH 90 clone recipe, that calls for the hops to be mixed, and added in in .25 oz increments every 7.5 minutes.  Can beersmith get an appromixmate IBU?
Keep up the great work!

Phil

Couldn't you compute the individual amounts added at each 7.5 minutes and list them seperately?

Create a new hop type called "Blend" or something like that.  Assign the AA% as the average of the hops in the blend.  Add this at the 7.5 minute interval

That should work

Fred