英语翻译您好我在PTC ASIA上了解到贵公司.您在中国有办事处吗?如有,请提供其联系方式.

看看以下内容：
Dear Sir/Madam,
How are you?(可以省略,与国外公司交往要直接一点.但是可以考虑先来一段自我/公司介绍）
I/We learned about your esteemed/fine Comnpany from PTC ASIA.Do you have any representative office (也可以用branches/rep.office/offices 等等) in China?If you do,please/kindly provide me with your contact information.
(下面最好也附上你们自己公司的简介) “We are a (XXX性质,例如国营、合资、私营...)company specializing in XXXX（业务类型）,.Our contact person is Mr/Ms XXX.Please do not hesitate to call us on (86)电话号码 or email us for further information.”