A conditional expression is neccessary, I think?

[markg2]

Office 365 home--

Problem:
If I enter a + value in either the Increase, col K or the Decrease, col M I want the running Balance in col O to automatically, properly adjust to the revised balance.

Solution ?
Although I've never used the process before, I think the solution requires using a conditional phrase/formula in the Balance O col cells.

Such that the conditional formula would see an entry in col K and add the value to the Balance col. Or, on the other hand, if the conditional formula sees an entry in col M it would subtract the value from the Balance col.

I'm attaching the spreadsheet in question.

Would someone be good enough to provide the formula that I'm looking for along with a link that explains usage?



Mark

[xor]

Maybe like the attached.

[markg2]

Precisely what I needed. Thank you!