Adding a new Fixed Asset acccount to ReckonOne

I want to record the expenses incurred building several rooms in a building. The only default  fixed asset accounts in my Reckon One Sole Trader account is "Plant and Equipment" & a sub account "Less Accumulated Depreciation on Plant and Equipment Plant and Equipment".  

A room in a building does not strike me as plant or equipment so should I be creating a new "Building" fixed asset account with a corresponding depreciation account?   I notice the accounts created by Reckon One have export codes . How are they used and can I ignore adding them to accounts I create myself?