I think I know what this dream means.
If amputation is performed to stop the spreading of a disease such as gangrene as a complication of frostbite, injury, diabetes, hardening of the arteries or any other sickness that impairs blood circulation then it is time to stop what you are doing in connection with a loved one (talk to them) and think about how they feel.
To see an amputation being carried out in a war due to a loss of blood and infection in a person who has suffered severe untreatable damage to a limb denotes times of money and possible gambling.
If in your dream you are performing an amputation means that the area of your life which will change will be your own decision.
Amputation | Dream Dictionary