I don't really use YNAB to strictly budget either, but more for tracking as well. Essentially, I budget the fixed categories (mortgage, property taxes, insurance, etc.), move some fixed amount to a savings category, and then leave the rest as "To Be Budgeted".
Then, as the month goes on and some of the categories that didn't have a fixed budget are "over budget", I just move the required money to the individual category to zero it out. Anything that caries over to the next month goes to the savings category.
Then, as the month goes on and some of the categories that didn't have a fixed budget are "over budget", I just move the required money to the individual category to zero it out. Anything that caries over to the next month goes to the savings category.