Originally Posted by Pappers_
Well, you can plug these ingredients into BeerSmith and it will show you percentages. So, start with the Pale Malt and put in, say, 6 lbs. Then you can begin to mess with the other ingredients until the percentages are right and the style guidelines are what you want (right OG, for example).
Maybe you mean this....BeerSmith will actually let you set the grain %'s directly via the Grain PCT button. It gives ou a pop up where you can set the %'s, e.g. 80% for 2-row, 10% for ... and then it will repopulate the amounts based on the percentages.