Thanks for the follow-ups guys. I'm still a little bit confused though when you talk about putting it into an off-budget savings account. I have an "Excess savings" line item under the Savings category that I budgeted $300 for the month of January. We ended up having a total of $174 extra dollars from spending less in other categories (fuel, alcohol, daycare), so in total I transferred $474 to savings. Since I did that, it shows that our total available balance for January is $0.00 for all categories combined, but individual categories still show the leftover amounts, e.g. $121 in daycare, which is rolling into February.
I'm posting a screenshot here to see if that helps. Maybe I'm just overthinking. I'm also wondering if there may be a difference for Mac vs. PC software, because I'm unable to get any options if I right click any individual cells in any portion of the row (other than Rename/Delete).
(Side note: sticking to YNAB this month helped us seriously decrease our spending across the board. I used to think that MMM's annual spending posts were full of it, thinking there was no way you could spend so little, but I'm seeing now how possible it is, especially if we didn't have daycare expenses.