I'd like to add something to what you have just said.
对于你刚才说的问题我想补充一下。
I'd also like to point out that we offer top quality service.
我还想指出的是，我们提供最优质的服务。
I'd like to add that we have the best sales support network in the industry.
我想补充的是，我们在这个行业中有最好的销售支持网络。

I want closure on the salary issue.
我想结束对于工资问题的讨论。
Let's finish what we were discussing.
让我们结束我们一直在讨论的问题。
The issue of the budget should be decided first before we move on.
我们继续讨论之前，应先确定预算问题。
Shall we finish this item?
我们结束这一项好吗？