How do you maintain multiple shift depreciation in asset master?

The following steps are needed to maintain multiple shift depreciation:
1. The variable depreciation portion as a percentage rate is to be
maintained in the detail screen of the depreciation area.

2. The multiple shift factor is to be maintained in the time dependent
data in the asset master record. This shift factor is multiplied by
the variable portion of ordinary depreciation.

Once you have done the above the SAP system calculates the total
depreciation amount as follows:-

Depreciation amount = Fixed depreciation + (variable depreciation * shift
factor)