Different depreciation Key for one Asset class

Hi,

We have created one asset class 1000010 for Building...

Also, we have created 3 different types of depreciation key 101A (Useful life is 5 Yrs), 101B (Useful life is 10 Yrs), 101C (Useful life is 15 Yrs). Now how can we assign these multiple deprecation key to single asset class.

We don't want to insert manually "Dep.key" in Asset Master--> Depreciation tab.

OR we have to make 3 different asset classes to configure the depreciation separately.

Regards.