Entering hundreds of hours as hours.

hi Folks
I'd like help with the following...I've attached the file
I want to enter the total number of hours used on a  part e.g. 722.21 (722 hours, 21 minutes). However when I try to enter this into Component Hours starting I get 02:21:00
. Essentially I need to enter a formula that adds Component hours starting plus Hours used to date (that is using a sumifs formula to accumulate from another sheet - which is working fine) and subtracts this total from Life Limit (hours) so I end up with the amount of hours left . This also needs to be shown in hours.
Thank you as always :-)
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Saqib Husain, SyedEngineerCommented:
Use this custom number format


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
agwalshAuthor Commented:
Did exactly what I wanted. Fixed the problem.. :-)
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Excel

From novice to tech pro — start learning today.