Hardcoding formulas

Hello,

I have a formula that I want to apply to a cell. Now the problem is that the very same cell that I wan to apply the formula I also want to manually enter data, is there a way that I can do this.

For example I have a formula that reads the difference between A1 and B1 and puts it in B2, now I also want to manually write a number in B2 is there a way I can do this as to not delete my formula

Thanks In advance

No I dont think so. But there are lots of other cells to use! If for example you use B3 for the manual input then you could adapt the formula in B2 to use the formula if for example cell B3 is empty or use the data in B3 if it is not empty.

I have two cells one Name'd Forcast the other named actual.
Lets say that for example in A1, I have 20 hours forcasted and in B1 only 15 occured

And in A2 25 hours was forcasted and In B2 25 happened,
Now in B2 I want it to account for the remaining 5 hours of work so it should read 30 hours and I have to manually enter the 25.

Basically what I want is for B2 to read the difference between A1 AND B1 witch is 5 and then I want to be able to manually write in that months occured hours and then have the two numbers be added up in that same cell is that possible

Is there a way to do this without using another refrence cell keep in mind I am doing this for 200 plus units over a peroid of 2 years so it is a little harder to use 3 cells