Half year rule for fixed asset additions

Hello, I have several fixed asset cards where I need to record additions monthly. I need the additions to follow the half year convention/rule, while the original book value of the asset depreciates normally.

Does anyone know how I can make this work? The half year rule works during the first year of the fixed asset card, so any additions will not follow it. The only method I can think of is creating a new fixed asset card just for the addition and at year end combining it with the original asset, however this would entail creating 12 additions assets (one for each month) for each original asset so I'd like to stay away from this if possible.