Fixed Asset question

Hello,

When we purchase a new asset that is replacing an item previously capitalized and depreciating, we process a partial retirement on the existing asset. We use the CPI Inflation calculator to come up with the value to use as the partial retirement cost. We are ending up with a large net book value loss to record. Is there another way to perform a partial retirement so that we don’t have a large loss? Perhaps where the new value equals the net book value loss.

Thank You

SD