急!!!!!!!英文問題:如想講零件另計應該點講?

我想講$XXX上門維修，零件另計應該點講呢?THANKS!
For the door to door maintenance service, it will be at the charge of $xxx, not including the cost of any parts to be replaced.


2008-07-11 17:34:11 補充：
door to door should be "door-to-door"

Door to door maintenance /reparation services for HK$XX. Spare parts not included.

我想講$XXX上門維修，零件另計應該點講呢?THANKS!
On door service charge: HK$ 250.00
Spare parts will be charged in additional if needed.

Not including parts

零件另計應該可以讲成是Necessary spare parts to be replaced is not including and separatly quoted.