I am afraid your point is not relevant.
恐怕你的意见与会议无关。
Your remarks seem to be beside the point.
你的发言好像跑题儿了。
You seem to be getting off the point.
你似乎跑题儿了。

Can you just deal with item number five?
你能否只处理第五项议题？
Let's just deal with the price issue.
让我们只处理价格问题。
Why don't we stay on the quality control issue?
我们继续讨论质量控制的问题吧？