Learn English – How to say “Not all of them do something”

sentence-construction

I wrote:

However, not every data region is used for data extraction; some of them are employed to restrict the scope of other regions to certain portions of the page.

Data region is a label for a thing in the software, I want to say the purpose of all of them is not the same thing. How can I say such sentences, for another example

Not all of them ? are designated ? to do something, some of them are supposed to do it…

I have two problem, one is that I don't know the structure to except somethings from a task, and second is that I don't know a good synonym for "designated "

Best Answer

I would phrase it as:

However, not all data regions are used for data extraction. Some of them are employed to restrict the scope of other regions to certain portions of the page.

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