高手check grammar

1) My main duty is to provide purchasing support to UK Head Office, such as sourcing, costing, order processing.
你幫uk 購貨用 - purchasing 比較好
2) Mostly our orders are domestic orders in UK, Hong Kong Branch is hard to know the annual turnover and how popular the products are exactly.
Mostly - 多數 , 唔洗 most of the
Hong Kong Branch - 直接 , and our...不用哩
annual turnover - 已經是數量不需 how much 哪

We are the back-office of the UK Head Office. My main duty is to support the merchandizing department of Head Office, such as sourcing, costing, order processing.

開始時，說明你們只是做後勤工作會好些。

The merchandizes are mostly related to domestics within the UK territories, therefore, HK Branch Office is hard to know the exact turnover and the popularity of the products due to the different geographical locations.

因購買貨品只是在 UK 境內，HK Branch是難以了解 TURNOVER 實際狀況，兼且地理遠離，受歡迎程度更難知道。