I don't understand what you are asking
if you buy an asset, that is not an expense at all, it is a purchase of something you keep on the books as an asset or as inventory.
If you bought an asset and borrowed money to do so, the full amount borrowed is the cost of the asset, and the debt is now a liability account, you pay down the loan. That is also not an expense, and when paid down does not affect the asset cost
Could you explain in more detail please?