Sorry, I should have check it carefully. Your formula =IF(A1<=200,0,IF(A1>300,99,A1-200)) did not work for greater 300. The 99 in red it should be varable number meaning any number and not 99. Here's an example I created by month.
A B C
Jan. 285 85
Feb. 305 85
1. For January cell B is greater than 200 but less than 300 and cell C shows how much it's over 200.
2. For February cell B is greater than 300 therefore for February cell C number you use your last number that is greater than 200 but less than 300 for February cell C. In this case it was last month which is 85.
Bottomline is that you don't report any number that is greater than 300 for cell C. It's always greater than 200 but less than 300 for cell C so in this case we use the same number from January cell C which is 85 for February cell C.
I'm not very good explaining things but I hope you have a pretty good idea what I'm getting at. Thank you.
Oh, =IF(A1 <=200,0. This is good.