以前送ったメールの返信がまだないのでご連絡差し上げました。
複数の項目を質問しましたので、時間がかかるかと思いますが、すぐわかる項目だけでもご返信頂ければと思います。
やり取りがスムーズであればあるほど、より早く製品を販売出来ます。
ご返信お待ちしております。
I have asked several questions, so it may take time for you to answer all of them. However if you could advise partially that you can answer easily, it is very helpful.
The smoother communication helps us to start selling the products earlier.
I am looking forward to hearing from you.
I think it will take some time because you've inquired about several items, but it would be great if I could have a prompt response about the items you do know about.
The smoother our exchanges are, the faster we'll be able to sell the products.
I await your response.