Question: I have a client with multiple rental property. How can I assign 1 asset to one particular rental property.

Answer: You need to set-up separate groups for each rental properties where you will add the assets.
Once done, you need to complete worksheets for every rental properties

And inside each worksheet you need to select the depreciation for each properties
 
You need to set-up separate groups for each rental properties where you will add the assets.
Once done, you need to complete worksheets for every rental properties

And inside each worksheet you need to select the depreciation for each properties