Well....

Sometimes head retention is hard!

Seriously, though, the first thing you want to do is convert it extract. The extracts have to be listed as alternatives to the grains, for that to work. In each grain, at the bottom of the profile (Ingredients > double click on a grain) there is a field for which extract you want to use to replace it with. The name needs to match what's in the grain database.
It's a tedious process to set up, but if you convert a lot of recipes, it will be helpful for the large amounts of grain.
The other method is to just remember that 10# of pale grain roughly equals 6# pale dry extract or 7# of pale liquid extract. You can make minor adjustments to be perfectly accurate, if you wish.
For 5 gallons:
10# Pale malt = 1.054
6# DME = 1.052
7# LME = 1.056
I'd keep all of the character grains the same, but add 50% more weight if just steeping.