哪位朋友帮我翻译个句子，商务英语类的，谢谢~~

Because of the weak market demand, the sales of "Tail Blade" was unsatisfied.
For the purpose of our inventory management, could you please help me to change the Tail
Blade to Main Blade?
I will pay for the transportation cost.

你是否向美国供应商要求退回 "Tail blade" 代之以 "Main Blade"? 是是涉及两程运费？
I will pay for the transportation cost [of shipping back the "tail Blade to US]

Because of the market demand, we got an unsatisfied sales figure for Tail Blade. To maintain a reasonalbe inventory management, could you please help me to change the Tail Blade to Main Blade? We can be charged for the expenses for transporting them to America.

As a result of market demand, Tail Blade our sales have not ideal.

As the rational management of inventory, can I will tail blade replaced by Main Blade.

I will pay it to the United States shipping.