Formulas to show all previous depreciation combined, and also current depreciation.

What happens when you ask a production manager to help out with creating an accounting excel sheet?? You find a forum! Appreciate any help in advance!

I need to create a formula that will calculate straight line depreciation. I need it to show a combined total of all previous years/months depreciation for an item, and also the current years depreciation. I have included a layout of how they would like it to look. I have come real close with some formulas I have found online, but not quite there yet.

Thank you again,

Mo