Here is my effort, Calli, for what it's worth:

Dear Sir or Madam:

Thank you for sending your company's relevant certificates and materials. Re: the problem with the certificate and the preliminary expenses, our suggestions are as follows:

I. Charges Calli, I did not reiterate that these are your company's suggestions: I had just stated that fact above, and believe that the reader ought to know this! However, if good manners (or whatever) in your culture dictate that you say again that these are suggestions, go right ahead.

Certificate manufacture cost (delivery included) --------------- CAD25
WILLIS University charge --------------- CAD15
MOLSS(Ministry of Labor and Social Security) charge --------------- CAD10
HILL charge --------------- CAD10 I am assuming that the reader will definitely know what HILL is; if the writer has any doubt about this, an explanation should be put, like you did with University and Ministry of Labor and Social Security.
Total: CAD60, about RMB600 per certificate

II. Process for certification

1. Calli, I think you need to say WHO will provide this. Your company? The reader's? If yours, you can just say, "We will provide..." Provide detailed introduction of WILLIS University and the certificate to be issued by the university.
2. HILL will submit the relevant materials for evaluation by the You need a specific name here, instead of "concerned authority body" (I think you mean what we would say as "appropriate body of authority". But in this letter you still should put something specific). This sounds like it might well be some sort of committee, in which case you would put whatever its name is. Let's say it's the Certification Committee. Then you would put "HILL will submit the relevant materials for evaluation by the Certification Committee." If it is a panel of judges, say "HILL will submit the relevant materials for evaluation to the panel of judges". in MOLSS.
3. When the evaluation passes, HILL will bind the WILLIS University and the General Management Performance certificates together and circulate them among all current and prospective students. WILLIS University will provide HILL with two levels of certification, corresponding to the basic level and the general level of General Management Performance respectively. Currently 100,000 students in China are learning the General Management Performance courses.

III. Problem re: preliminary* expenses

There are several expenses mentioned in the action plan by your company. If HILL carries out this program, there will be the following:
a.) translation fee (translating the introduction to the involved courses into English for your assessment);
b.) MOLSS evaluation fee Again--they have just read the explanation above, of the evaluation; but if you think it should be stated again, go ahead.) ; and
c.) project operation fee will occur as well. Um--I am left wondering what this is; but perhaps your reader will know.)

The General Management Performance certificate carries formal credit within China in well-known universities such as Tsinghua University, China Central Radio and TV University, Shandong University; and none of these incur these kinds of fees. Therefore, HILL suggests that your company finance such expenses as the evaluation fee, application fee, authorization fee, and project operation fee; and HILL will finance the translation fee and MOLSS evaluation fee as well as the project operation fee. Both companies should then benefit, as more students apply for this certification.

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Whew--I felt greatly handicapped by not knowing what any of the things are! I hope that this ignorance did not change the significance of some things to something inappropriate. For example, it almost sounded like the letter came from a university; if that is the case, it would not be referred to as a company. Oh--also--if Willis is the name of a university, it would not be written as WILLIS. However, if it's an acronym like MOLSS, then putting all capital letters is good. Good luck!

*I am not at all sure that "preliminary" is the correct word, now that I think about it. Preliminary means before; this might work if it has already been understood that all fees, no matter what step they are for, will be paid in advance of any processing being done. If this is not the case, you might substitute something like 'additional' fees or 'special' fees.
I thought about this while reading the last part of your letter. It sounded like the recipient's company creates fees that others have not created; if that is not correct, I apologize.