Unit of Production question

Hi,

The client here has assets which are going to use UOP depreciation keys. However, on one of these assets the depreciation rate per unit is not equal to the APC / total # of units available.

Instead they want to assign a fixed rate.

for example, if apc = $100 and total units = 10, then your depreciation rate per unit is $10.

however, they want be able to depreciate $11/unit.

They also want to be able to change this fixed rate whenever they want. So they might change it to $10.50.

is this possible?

Thanks,

James