Defining Canadian Depreciation Methods

 Has anyone defined the Class 8, Class 10, Class 13, or Class 45 depreciation methods for Canada? I'm not familiar with the formula methods, but I don't think the system provides enough variables for these methods.

Class 8, 10, and 45 use the same formula with different rates:

UCC of Prior Year + Additions + Adjustments + Disposals = UCC

UCC - (50% * Additions) = Reduced UCC

UCC at Year End = Reduced UCC - (Reduced UCC * Rate%)

Rate% is either 20, 30, or 45% depending on class.

Class 13 is simpler. It's STL, minus Disposals.

Thanks!