Questions about example sentences with, and the definition and usage of "Manpower"

A: 沒有重要的區別。 可是manpower planning可能有"工人用力“的意思。 Human resource planning比較像“辦公室的事情”。 但是在口語裡這兩個詞都一般一樣的。

A:
I "proposed" your international manpower training course to internationally co-operate with A.
I guess there's no need to actually include the word "internationally", cause the sentence already states "international training course" so it carries the idea on its own but still you can say it anyway as it is.

A: workforce is all the workers by a specific organization or specific project. while manpower is the total available workers

A: × If we have manpower in Nintendo group, we should use them; however, if not, we should hire people from outside.
✓ If we have the manpower at the Nintendo group then we should use it. Otherwise, we should hire people from outside.

× You sound like you are fine with either opinion, is my understanding correct?
✓ You sound like you are fine with either option. Am I understanding it correctly?

× I believe there are pros and cons for both opinions.
✓ I believe that there are pros and cons for both.

A: × We are short of manpower.
✓ We are short on manpower.

short of = we have less than X
short on = we don't have enough of X

A: ...short on manpower...

A: "All flights arrived at the same time, so (now) we are short-staffed." You can use now or not, either way the sentence meaning stays the same. :)

A: I can provide you with manpower, but you'll have to share the profits with me.