Add the grated cheese to the sauce.
This latest incident will add to the pressure on the White House.
He added enormously to the national forests in the West.
When I see "add", I think something is followed,then a target is intruduced by "to".
So, sentence 1 is easy to understand for me.
But for sentence 2, does it mean that "the incident" is added into "the pressure" so that "the pressure" is "bigger"(more pressure)?
And for sentence 3, it sounds very unnatural to me. Does it mean more forests or more acreage? Would be there any difference by replacing "added enormously to" by "enormously increase"?
By the way, why is it "added enormously to" instead of "enormously added to"?