If you are using QB Online (SimepleStart, Essentials, Plus or Advanced) you can decrease the value of the asset account and then increase the depreciation expense account.
As I stated though, you cannot do this in self-employed. You need to be using one of the versions of QuickBooks Online.
You have clicked a link to a site outside of the QuickBooks or ProFile Communities. By clicking "Continue", you will leave the community and be taken to that site instead.