Running Balance

I am having trouble working out the formula for the attached.
columns e to l need to be a minus total and column m is to be added. All to be added to the above total in column n but not to show anything if no entry.

I have created a sum if formula but can't get it to work properly.

I know their is a formula to hide formulas if nothing is equalling it. More advanced than using conditional formatting. Thanks, but no thanks.

Thanks but I also need it to not show any formula if nothing is entered.

Sorry Roy but I did find you helpful. That formula however won't work at all. :-)

Roy, got it. You were so so close. Many many thanks. Awesome help.

Thanks for the feedback. I was taught a long time ago that "feedback is a gift that you can choose to accept or reject". On this occasion, I think I'll pass ;-)

To give negative rep to someone who has only tried to help you seems a bit harsh:

I feel you need to learn alot more about Excel before you can start helping people. I actually know more than you.

This seems a somewhat subjective statement and I would have more confidence in its validity if there were some evidence of your knowledge elsewhere in the forum ... but there isn't, as far as I can see.

I wish you well and hope you get answers to all your questions, issues and problems. Rest assured that none of them will come from me ... or, at least, you won't see any of my pitiful attempts at help.