I decided to put some ideas in one post, so this is a duplicate at first.
Here is the formula, based on your example. This example uses a column value for the limit. Note that you can copy this formula to all the subsequent rows of the column and it will automatically use the right cells. This is an Excel thing, not something I did.
I also noticed the "target" column and decided that selecting from a drop down list that you can maintain in a column, or even on another page, would be nice. Use the "data validation" selection on the "data" tab to get to this.
