The Wisconsin constitution has given governors the power for line item - or even partial line item, as in this case - veto since 1930. The federal rule doesn't apply here.

And there's a check on that power in the state constitution that says that the governor may not "create a new word by rejecting individual letters in the words of the enrolled bill, and may not create a new sentence by combining parts of 2 or more sentences of the enrolled bill." This is numbers.